"I only installed a Intel Quad 2.66Ghz CPU, I can upgrade in the furute."
Hate to disappoint you. In the not so far future, Intel will bring out new cpu's with new sockets so forget about upgrading unless you can find socket 775 cpu's at that time.
My personal opinion is forget about upgrades. By the time you want to upgrade PC technology has advanced and you can no longer buy old stuff that fits your then old motherboard....
