New computer

Hey guys I'm going to be building a new comp by february. Its mainly going to be for gaming but this is my first build by myself, I want to put a socket 939
AMD athlon 64 4000+ or the X2 64 in it. I'm probly going to go with water cooling for the processor. The video card I'm going to get is the ATI X1800XT 512MB GDDR3. The only thing is I dont know what mobo to get cause theres so many, I know it needs to support socket 939 and the X2 and have a PCI-E slot but alot of the boards I look at are SLI and nvidia supported and I was wondering what a good gaming ATI supported board would be. also I will only have $1600 to do this build witch should be enough. Also the price of that video card is 489.00$ if anyone was wondering. Also I almost forgot to mention
that the FSB on the mobo should be 1GHz. 

>>1


 This may be a little late, but with the components you've listed, $1600 isn't going to be enough. Or maybe it might, just barely.

 An Radeon X1800 is going to be at least $400, a decent motherboard at least $150 (maybe, a little less), a monitor will run you at least $150 (and that's going cheap LCD, ok CRT), 2 gig of memory will be at least $100 (once again, going cheap), the processor is going tobe $200+. Alos, you've got to get a case to put it all in, a cooling system, a harddrive or two, speakers, input devices, maybe a sound card, a power source (if it didn't come with your case, or if the one that did isn't strong enough), and also a UPS or other battery backup (yes, this is worth adding to the cost. You're spending $1000+, consider this insurance)

 Now, $1600 can build you a decent rig, one capapable of modern gaming, so you don't have to get teh absolute "best" of everything. (Going "middle of the road" isn't a bad idea. Computers become dated within 2 years these days, so unless you're stupidly rich, don't always buy the most expensive parts) A screaming fast one will be $2000+.