as sirpullido said, go with custom computers.
1) they are cheaper (i have an uncle who could make me a super pimp computer for less than 1/3 the price you pay for it at the store).
2) they are faster and can be more powerful.
3) easier to upgrade/downgrade being there is more space inside the tower.
4) they can look cooler if you case modify them.

So this baby seal walks into a club.