I get 9500 on my Asus V9999GE card, which isn't quite a full GT card. But I've only a P4 2.4C right now. Seems like you should score a bit higher than that.
Granted, 3Dmark should not just used a baseline for performance, neither should Aquamark. I'd suggest you go take your favorite games for a spin. See how it stacks up to your previous card. I know all my games more than doubled in speed going from a 9600 Pro to a 6800.