I need to upgade my computer, but I don't really know where to begin.
I mostly listen to music, surf the internet, play the occasial game.
Where do I start?

Specs
Epox 8KHA (VIA Apollo KT266 Chipset)
Amd T-Bird 1200 (200mhz)
512 mb PC2100 DDR
Maxtor 40gb
Nvidia Geforce II GTS 32mb
SB Live! value
Logitech 4.1 speakers
Lite-On 48x CDRW