time to upgrade

my pc stats

K8V SE Deluxe mobo
AMD Athlon 64 3700+ cpu
1gb pc3200 RAM
160GB hdd
vistiontek radeon x1950 pro video card
cd/dvd burner with lightscribe
400watt ultra modular psu

i hear about all these dual core CPU’s and how Intel is all of a sudden surpassed AMD in terms of performance? yikes when did this happen? Guess i need ot get back in the game here. I dunno thats a discussion for later. And hen theres the ddr2 ram. Im wondering is it time for an upgrade? i hope not! i just spent good money on a new video card! if not my whole computer, then what part of it? Oh and another question. Ive got a copy of windows xp pro x64 which i got from a friend who wanst using it. Should i use that instead of xp 32bit?