I play D:OS right now and I love it.

I also like many other RPG like Baldurs gate 1+2, planescape tornment, Fallout 1+2, Neverwinter nights 1+2, arcanum, gothic 1+2 and many others.

But I do not like games like diablo or sacred. And the first games have often been called "diablo clones". Fast combat action were you have to kite enemies perfectly because they kill you with 2 hits is not my strong point. I like it more slow and tactical. And I found diablo to be boring. Just walk around and click everything to death just to get a random weapon with 2 points more damage is not very motivating. I want a good story with some good quests.

Based on what you say in your post, I think you probably will like the original Divine Divinity; it's akin to Baldur's Gate and Arcanum in its pacing.

I want to clear something up about the word CLONE that is seriously beyond annoying.

The term clone is constantly being misused, and then people are just accepting the misuse of the word and actually trying to argue about the definition with nonsense. So to clear something up, the term clone literally means an EXACT COPY, so it's impossible for something that is not literally an exact copy, to be a clone.

Anyway on the subject, one game you will want to look into is Dawn Of Magic.
Developed by: Skyfallen entertainment and published by, 1C Company, Deep Silver, and Atari

I am very impressed with Divinity II: Developer's Cut. I actually find the graphics superior to D:OS; which surprised me, tell the truth. D:OS looks more like the WoW/Torchlight style which is more cartoony, imo. Still, I just got D:OS, so I need to get much further in the game before doing any real comparisons.

As Luned recommended in her post, Divine Divinity is a must try. It has action oriented combat like diablo but is backed by a good story. Although it plays like an arpg, it does not have the endless grinding diablo has, so I think you'll like it. Highly recommended!

My list of favourite games is very similar to the list in your post and found the original more than playable. There's a couple of areas at the start that felt tougher than they should be but other than that you can explore, role play (a bit) and play tactically. The developers sense of humour is very apparent as well so bonus points for making me smile.

All games are completely different IMHO.
Divine Divinity (not played myself but watched some videos) is more like BG1+2, but you have no party and are mostly or always alone?
Divinity2, Directors Cut has a very good graphic and a unique system, where you actual fight as a dragon the air- and as a hero the ground combat. Not too twitchy but much more action than Divinity1.
Dragon Commander has good graphics for an RTS with roleplaying elements. Again complete different concept.
Divinity: OS has BG1+2 style dialogues and game play with turn based very strategic combat. You control a group of minimum two members, the skills complement each other. Unique play with magic, to be able to combine the elements for different effects.

You probably won't like Divine Divinity, because, contrary to what some say here, Divine Divinity has a combat system that's rather similar to Diablo/Diablo 2/Sacred.
In my opinion the only two differences between Diablo and this game are that Diablo gives you random maps and respawning enemies.
I liked the story, but the gameplay wasn't for me.

Beyond Divinity is similar to Divine Divinity, except you have a party of two and they messed up the skill system.
In the end it was the ridiculously poor voice acting/sound quality that made me stop playing this game prematurely.

Divinity 2... hmm... I dunno. You'd be best off searching for some gameplay videos on Youtube.
Personally I think the game's a blast. Not perfect, but lots of fun, humour and gratifying (although somewhat simplistic) combat.

None of these share any gameplay similarities with D:OS, and that's something to keep in mind.

I'm not a big fan real time - too inept to play properly - but I still found myself enjoying the original. There's a plot, tactical options and a pause button (or is my memory playing tricks) so I didn't find it such a grind as say Diablo and Torchlight.

It isn't party based and turn based though if that's what you're looking for.

I am afraid your memory is indeed playing tricks. There are no tactical options, nor a pause function.
I've played the game for a couple of hours today to refresh my memory, and it's really just fast-paced Diablo-like combat.
True, it isn't a grind like Diablo, but the main reason for this is that enemies in DD simply run out. :)

There is a pause function (space). You can take different approaches to combat, which can significantly effect the outcome, though calling it tactical might be a bit of a stretch.

I found for most of Divine Divinity I could switch between combat, exploring, and doing stuff in civilized areas, based on what I was in the mood for. The combat is Diablo-like, but there are also non combat related quests and things to talk to people about other than what your justification is for killing the next group of monsters.

Hmm, I never knew that. Still, I doubt its usefulness, due to DD's Diablo-like mouse button mashing.

I used it frequently...particularly to analyze what kinds of attacks a new enemy type was using. In some of the boss battles it was also useful to pause in order to check your health and issue the "drop everything and drink that poison cure NOW" command if necessary. ;)

Diablo I was such a click-fest. Never in my life before that time had I played a game that put such stress on my mouse buttons...;) What makes DD so much fun for me is how much it is *not* like Diablo. I managed to get Diablo 2 installed a few weeks ago under Win8.1 precisely because I had been playing DD and *what I remembered* from Diablo2's sound track sounded like DD's--or so I remembered. I was fairly surprised to actually see and hear D2 again--it instantly raised DD several notches in my estimation--indeed, DD sounded more like D2 than D2 (memory is a tricky beast). I remembered D2, well, let's just say "differently" from what the game actually is.

Edit: Feel free to set me straight on this, but IIRC D1 was strictly a 2d game, whereas D2 was 3d-accelerated under Glide--I run it now under a Glide emulator (also runs under D3d, I believe) and at the time the game shipped it was fairly exciting stuff on my V3...;)