I am still on a socket 939 AMD so if I want to go quad it is a new board as well. The intel quads seem cheaper but it is a lot of work finding a good board.

My other option is to just go with a AMD Athlon 64 X2 Dual-Core 4200+ 2.2GHz Socket 939 which is relatively cheap considering I don't need a new board.

I think I might give the 939 dual core a go and if it turns out to be too slow I will get a second box and do a 1-4 split.