pezhead53: I'm not sure exactly what you mean by styles
CRPGs comprise a wide spectrum of quite different games, one CRPG is not necessarily like another.
For example, in some you play a single character, in others your character has AI controlled companions, and then there are those in which you are allowed or required to manage a whole party of characters (preferably of complementing classes, like two melee fighters, one mage, one cleric etc.). In some combat is turn-based and as slow as you want it to be, in others combat is real-time and fast paced. The former require you to think tactical and plan each move, the latter require good reactions. In some a successful hit is determined by 'dice throws', in others by the player's skills. Some CRPGs are based on a rich and complicated ruleset, others are more or less self-explanatory and easy to grasp. Some are linear, others offer much room for exploration and choices. There are dungeon crawls and open worlds, CRPGs more focused on dialogues and plot, others on hacking, slashing and looting, epic stories that revolve around saving the world or personal stories about finding or saving yourself, some games that allow you to choose and customize your character, others that let you play the role of a predefined character.
A few subgenre examples are:
- Dungeon Crawlers (e.g. Might & Magic, Lands of Lore, Ultima Underworld etc.)
- Rogue-likes (e.g. Dungeons of Dredmor)
- Action RPGs (e.g. Diablo, Sacred, Nox)
- JRPGs (J for Japanese, more focused on linear story telling than customization, e.g. Final Fantasy)
- WRPGs (W for Western, very general term, often used for all kinds of CRPGs that combine storytelling with free character creation, open world exploration and choices that affect the path of your hero, e.g. Baldur's Gate, Morrowind)
- MMORPGs (e.g. World of Warcraft)
Anyway, if you want to try Baldur's Gate, I'd suggest playing a fighter character, because beginners might have a hard time playing spell casters on the lower character levels. And don't let the possibly bland story of Neverwinter Nights' original campaign discourage you. If you don't like it, just skip it. The add-on campaign Hordes of the Underdark is actually quite good, and you can find lots of free user-created campaigns of high quality on the net. I also second the recommendation for the indie RPG Avadon - The Black Fortress (not on GOG). It's both a typical isometric WRPG with turn-based combat and pretty simple and comprehensible regarding the few rules.