You've got a very nice system Myth, but all 4 of my A64 systems are faster in 3D gaming and 3DMark2001 benching. In 3DMark03 your P4 would probably beat my 3700+ (not at 3800Mhz though), but not my FX-51 or either of my FX-53's.
When you get your X800 XT you'll have to run some benchs.
Here's something to shoot for (my score with stock cooled X800 XT and unmodded A8V motherboard):
Stock X800 XT 3DMark2001 Score
And here's a fully modded 3.4GHz P4 Extreme Edition w/ DDR Maximizer and running at over 4500MHz with a modded aircooled X800 Pro:
Modded P4 EE