u should wait till july, when there is a price drop. ur monitor link doesnt work, but if ur monitor is below 20 inch then the 320 mb will be fine for a gpu. go with the xp, vista is not that good right now. u wont need a sound card, unsless u want one.
u could save some money and go with the e6320, which is basically the same thing. and for the gpu, get the regular kind, not the superclocked, u can always overclock
that is an awesome. but i u wanna save some money, go with the rosewill.
Newegg.com - Rosewill RP550-2 ATX 2.01 550W Power Supply 115/230 V CSA, CB, TUV, FCC, UL - Retail