Best motherboard?

Hello, i want to get a new computer system. Im thinking of getting it custom built by a friend so all i have to do is buy the bits.

Can anyone advise whats the best motherboard for working and gaming on. I want it to be able to accept a 3.4 P4 and be able to let me play games with my Nvidia Graphics 6800 that i want.

I know the spec isnt anything major with whats out today but i wasnt sure what motherboard will go with that spec.

Thanks in advance.