Depends on if you want to go P35, or 680i, or x38..
A nice, user friendly board, 680i board I recommend is below.
A P35 board should support DDR3 but at this point that won't help you given that you already have the RAM, which I assume is not DDR3, but I could be wrong.
EVGA 122-CK-NF68-A1 LGA 775 NVIDIA nForce 680i SLI ATX Intel Motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E16813188013
This MoBo seems real user friendly, some good reviews, and a good price overall, plus some nice extras?
Hope this helps