what kind of case u want(atx tower micro atx 2,3,4 cdrom bays)
cpu(speed,socket,fsb,)
are u gonna overclock it or no?
play alot of games?
rip cds?
whats the main purpose of ur computer(games multimedia, graphics, documents,internet)
do u want a cdrw or dvdrw one or 2 separate cd drives?
how much harddrive space u will need?
how much ram u need?
card reader, floppy drive extra case fan? led lights and all that blinkin stuff?
side window?
monitor,keyboard,mouse?
speakers?
any extra pci cards like wireless card?
i basically broke down my own process of picking a computer cuz im building one at this moment