For PC, with an amazing storyline and such goodies. The ones i've played so far are: Arcanum, ES: Oblivion, Dragon Age: origins, etc. Looking for atleast as good experience as Arcanum was (that shit was amazing).

Fallout series.

1. elder scrolls
2. kingdom hearts
3. Zelda

Some games that i really loved the single player

Your best bet is the upcomming ''Skyrim'' i guess

agreed

Baldurs gate 2 / Planscape Torment / Fallout 2 are top of the line.

1. Fallout 1/2
2. Baldurs Gate
3. Planescape Torment
4. Might & Magic
5. Arcanum: Of Steamworks and Magick Obscura

Yeah I'm looking forward to that. I'm trying planescape for now. But it seems to be having a smaller world than arcanum and much worse character creation. Apperantly it has an amazing story so I'll keep playing that for now.
Is Baldur's gate closer to Arcanum style than planescape? Cause I might try that too. Arcanum brought me lot of good singleplayer gameplay experiences with its rich and detailed world so before I have Skyrim, I'm still looking for an rpg as close to Arcanum as possible

have you played starwars knights of the old republic? it's a bit old but it's an amazing game, don't forget the Witcher and the Witcher 2... you have to play these