Bought a Dell dimension 3000 before I realized it didnot come with a AGP or PCI-e slot. I am going to take the Pentium 4 Processor (3GHz w/HT Technology and 1MB cache) and 1GB DDR SDRAM(400MHz) out and build my own system because I'v already got a spare ATX case in hand. My question is what kind of motherboards I shall choose for a budget like 100 bucks. Shall I choose one with AGP slot or one with PCI-e slot?