also - as much as we all love our wireless and mobility, you'll get faster speeds if you connect to your cable modem/router directly. :) Long cat5 cables are cheapest off of eBay. I bought a 50ft cable from SquaredSolutions for $9.95, free shipping there.

Nvidia GeForce is an excellent manufacturer of graphics cards. They usually have built in fans on the graphic cards themselves which is great! Keeping systems cool is always best!

If you can get a bigger hard drive or install an additional hard drive, that's a good way to improve machine performance as well - basically more swap space.