I would rather go for the HIS X1600pro. Also, if your getting a PCI-E board you might as well get the XT instead.
Theres just no way a x1600 period could beat a 6800 gs/gt/ultra. Maybe get close, but the luck would have to be so high. In some benchies I managed to find the x1600xt is close in some and smacked aside in others. Even with the decent oc's people were getting (Look to be 100 mhz higher on both sides) it wasnt enough.
My 6800GT has beatin an X850XTPE. Its nothing special and its not what its hyped up to be. Not to mention the NON SM3.0 support.
EDIT: I have just went to the site you looked at and im suprised you actualy believed a single bit of that ********.
Come on!
A 9800XT beating a 6600GT?
THE X800XTPE is beathing THE X850XTPE?? AHAHAH Now that is SOME kind of funny. I mean seriously, it gets funnier as you scroll down. An FX5950 beating a 6600GT? Youve got to yanking my chain here. At least page 6 looked a LITTLE better. Man those benches are so whack the man down the road on crack makes more sense.