Upgrade paths - need help

[Amplifier]

I currently have

Abit NF7-S Rev.2
Athlon 2100+ XP o/ced to 10x180
1 GB PC3200 DDR RAM
FX5700 Ultra

I am deciding between Athlon 64 either 754/939 or a new video card (6600gt). What do you guys think?

[Aphex_Tom_9]

a64