I am going to have to build completely new anyways because ATI and Nvidia have basically said "F*CK YOU!" to me and the many others who built high end systems during the first 3 quarters of 2004.
Yeah right, get a 6800GT because they are rapidly dropping price, overclock the crap out of it with an Nvsilencer and your computer will still be set for quite a while....once it comes to the point where your computer is getting outdated and you REALLY start to notice it in games because you have to sit with no aa, no AF, medium settings...you'll be ready for a complete system overhaul anyway.
The only thing that's holding your system back now is the X800pro which like I said a 6800GT would remedy that...sell that X800pro for $100 if you have to, I just had to sell my 6800GT for $200 even though I paid $400 and its still $300 in a lot of places.
Learn overclocking and boost up your CPU and RAM power....if you've got Kingston HyperX then those should have BH-5 chips which will OC very well, however you'd need a lot of voltage which I don't believe that asus board can give, but I'm sure they'll still want to go up a little bit.
There are other solutions to making your computer go faster without cursing manufacturers and thinking you're the only one being tossed to the ground.
I paid $135 for an nf3 ultra-d board I used for 3 months but was unstable as hell and then had to say screw it and just give up, cut my losses and go to PCI-E and a stable board.
It was known that during the last year there were LOTS of hardware changes and I remember tons of those topics back in the past....moving to the new sockets, 754 being dropped, AGP being phased out, etc...etc....so this should all really come as no surprise.