OT, but the retail version of Titan Quest does not have DRM. I highly recommend it as a Diablo Clone (in fact I find it superior in several ways). Today on Amazon its $8.99 with free shipping (and includes expansion).
Also, definitely check out http://www.grimdawn.com
/ (from the makers of Titan Quest).
I may pick it up, but I really shouldn't seeing as I have a huge backlog of games and it would be nice to limit the number of sites that I have games from.
As for Grim Dawn, I suspect it will be on GOG, but the only confirmed locations when its released will be Steam and the humble store (if those are locations you currently buy from). But I highly suspect GOG will carry it too, It was kickstarted as DRM-free (a key is needed ONLY for matchmaking services), so I can't imagine why it wouldn't be here ;)