This is the hardest one for me, because everything I can think of all of you probably have played. It's really hard to surprise geeks with any video game really. I think maybe some SNES ones I had played, but its been over 12 years since I've played most of those so I'm not even sure if I'd still enjoy them now and there are others that I think are more obscure, but I wouldn't highly recommend because they were only ok to me.

Arc the Lad: Twilight of the Spirits
Dragon's Crown
Dino Crisis 2
Threads of Fate (I was going to omit this one, but I think it should be included because I think I've only seen a thread dedicated to this game on here one or two times).
Def Jam Fight for New York