Building my PC

I am about to build my own PC, updated from my present one. Which is built on a PCPartner motherboard with an Intel 815 chipset on it. The CPU is 933/133mhz Pentium III with 512mb Dimm ram. I am going to upgrade to a Pentium 4 and was wondering what would be the best motherboard to use. The one I am being offered is an Intel board, but I do not know the model number of the board. Any sugestions please.