The goal of my new box is to play UT 2004 and Half Life 2 (hopfully Doom 3) with all game details maxed out, have max antialsing and antropic filtering enabled with a res of at least 800x 600 - 1024x768+. The absolute lowest framerate would be 60, even with instence firefights and expecially during ONS matchs.
The budget for this is $2500, I'm saving a few hundred dollars by reusing my case, psu, sound card, and optical drives. Due to another project that I have planned and $$ issues, the pc won't be fully built and running till december.
Have you considered buying a Socket 939 motherboard? That way you can use both the A64 and 64FX cpu's. Plus you won't need registered ram. They are just coming out, but you should have a few choices on 939 mobo's by December. I think that would be a far better upgrade, no?