The Elder Scrolls easily.
You don't seem to be scared by dated gameplay so you can start with Daggerfall I think (Arena isn't that good and there's no continuity really) and then go with Morrowind, or start directly with Morrowind !
Could also try Oblivion but knowing you you won't like it.
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Best LPer ever, Gix ! : http://www.youtube.com/watch?v=Vt5YKmP7ecY