Ah, thanks Samuraid.

I found this one with some good reviews:
Newegg.com - ASRock 775i65G LGA 775 Intel 865G Micro ATX Intel Motherboard - Retail

What do you think? Also, I just have a standard IBM case, would it be easy to just install it? Just plug in everything? Do I need to format my HDD?

And would it be wise to get a better power supply? Something around 350w (I think I have 250w), as I have a 7900GS card and will be upgrading the CPU to dual-core 2.0GHZ.