Arcanum is a very good choice, it totally rocks, and it's HUGE!
The look&feel is much like divdiv.
It's also incredibly buggy and unbalanced.
Shhh!
Well, I can reccomend KotOR. So what if it's D&D based? You won't even notice it, nor you'll have to learn the d20 system (all you need to know is what the stats do). Try it.
If you are looking for something special, try Beyond Good and Evil.
