AMD or Intel? Newegg is a great place to do some general research. Just read reviews and compare prices.

If you're going for l337, I'd get a Gigabyte NForce3 Ultra.
http://www.newegg.com/app/viewProduc...128-254&depa=1

Here's a good board for a hundred bucks less.
http://www.newegg.com/app/viewProduc...136-138&DEPA=1

And if you're strapped, here's a few good low-end choices.
http://www.newegg.com/app/ViewProduc...180-039&depa=1
http://www.newegg.com/app/viewproduc...170-112&DEPA=1
http://www.newegg.com/app/ViewProduc...123-208&depa=1

What is it they say about silence being golden?