I'm not that much of a hardware person so my gueses on what to upgrade are not always that good so I am asking you guys what I should do :-P. Here is my box right now ....

Athlon 600mhz (MB allows up to 1ghz)
384mb RAM
ATI Rage 128
Quantum Fireball 20 gig HD
DVD-ROM
10x8x32x Acer Burner
19 inch NEC Multisync 95

What would be the best thing to upgrade to get better preformance out of my box. I'm not sure of the rpm's on my hard drive or any other info like that. Would boosting my procesor make much of a diffrence now a days (I've heard the contrary)? Thanks!