When looking to buy a graphics card, there are 3 formats, which basically means that a graphics card will fit in your machine if the type matches with the slot in your motherboard. PCI-E, AGP, and PCI are the three types. Video card companies are phasing out of AGP and using PCI-E because you can SLI them, which means put 2 video cards into one system. AGP is still a good format though, and you won't see performance differences between AGP and PCI-E. PCI slots come in all computers but don't have anywhere near the bandwidth that PCI-E or AGP do, so therefore PCI cards are not good at all.
AMD 64 3200+ Newcastle@ 2.2Ghz
1GB (1x1GB) OCZ Performance Series
ATI X700 Pro 256MB OC\'d 475/525
OCZ Modstream 520W
Samsung 914v 19\" 12ms LCD
SB X-Fi w/ Logitech Z 5300e