Heck, i got my plain 6800 overclocked to 420, almost ultra speeds, ultra is 425. the memory is also overclocked to ultra speeds which is 1100mhz. It's a heck a lot cheaper to do it my way.
With a plain 6800 you get a single slot heatsink and fan, instead of being a beast in size like the GT and the Ultra taking up two slots due to it's oversized cooling. Oh, the plain 6800 only needs one power hook up too. If you get ASUS, you get a free overclocking tool and the heatsink has bright blue LEDs.
Can I pimp my card any more? No.