I'm upgrading from a VERY OLD 1000 Thunderbird and can't decide on what to get. My 2 choices based on a $400 budget are Athlon 64 2800 or Athlon 2800XP. I'll be getting a new mobo with each processor either a VNF3 for the AMD64 or a DFI NFII Ultra for the 2800 XP and of course 512MB of PC3200. Any recommendations? Whatever I get will definetly be an improvement. Graphics card and hardrive are already up to speed. Thanks,