lets see I got mine custom for 500$ 160gig HD win XP sp 2 512 RAM 64bit int GFX (I'll buy a card later) amd 64 3000+ in full seriousness a celeron is like a downgraded PIII(though a PIII is better than a P4 for its clock speed) with the ability to be clocked higher, get a 64 bit AMD processor so you can use longhorn in 64 bit mode, Intell sUcks for the price.
