Yeah I also wanted a 939 motherboard but reviews say it only gives a 6% performace boost for twice the money.
I'm thinking of a
AMD Athlon64 - 3700+ 1Mb L2 s754 - Boxed
prosessor or less
As for serial ata Yes it's faster but it's not reflected in proformance once HD can write to memory without the processor it would indeed be a performace boost (heard somewhere they were working on that). But since this is not yet the case . I am however thinking of a raid 5 controller to adress the speed issue and since I am considering to upgrade later to 4 HD Raid 5 seems better DVD/CD drive over network.