A best bet is the AMD Phenom II X6 1055T 2.8GHz 6-Core Socket AM3 Processor (pictured), model no. HDT55TFBGRBOX, together with the Gigabyte Socket AM3+ 760G microATX Motherboard for AMD, model no. GA-78LMT-S2P, for $120. This $10 mail-in rebate cuts them to $110. With free in-store pickup, that's $100 under the lowest total price we could find for these components purchased separately elsewhere. The CPU includes a heatsink and fan and features six 512KB L2 caches. The motherboard supports up to 8GB RAM and features one PCI Express 2.0 x16 slot, one PCI Express x1 slot, one PCI slots, six SATA 3Gb/s ports, Gigabit Ethernet, and more.