If you can track down a copy of the old Total War games (Shogun and the first Medieval) I highly reommend those, and I'm pretty sure you can handle them. (They're strategy, by the by).
I believe you should be able to handle Fallout and Fallout 2 (RPG), and they're both being bundled for $20 at retail (along with Fallout Tactics, another strategy title).
For RPGs, check this place out:
http://www.abandonia.com/en/game/RPG?page=2
I most heartily recommend Betrayal at Krondor (DOSBox required) and Albion (if you can handle it. I BELIEVE you can...).
Space Quest and King's Quest are all also bundled (six games for $20), if you like point and clicks.







