I got a KN8-SLi 110 bucks at newegg. works great, overclocks, benchmarks right up there. one thing mounting must insulate non-metallic mounting holes on board, read instructions board will not post unless mounted just right. The CMOS jumper is a pain to get to (I need to get a remote switch so I can really do some overclocking). This was my first build and I had a easy time with this MOBO.
If you are going to be doing any overclocking, go with the abit, currently the two best brands for overclocking are DFI and ABIT, so go with the KN8, i have the AN8-Sli, one step up from the KN8, and it overclocks so much better than all my friends motherboards. Dont cheap out on your motherboard, it is the baqckbone of your system.