When I looked at the so called engineer who was blasting Intel on here and telling us about his wonderful $80 Phenom processor I did some quick research on AMD.
In a nutshell if you buy AMD you have to be comfortable with the fact that your motherboard may need to be replaced if you want to upgrade your processor.
If you buy Intel, such as a low end Core i3 processor you will be happy with it. But a couple of years from now, when the Core i7's go down in price you can pick up a decent Core i7, maybe even an Ivy Bridge and throw it into the computer (You have to check online to see which processors are supported). Upgrade the ram and video card and for less than a few hundred bucks you have a system that will easily be something worthwhile for another few years.
If you buy AMD, you will most likely have to upgrade your motherboard and processor. If you are buying a brand name PC you can't replace the motherboard because it may be propriety.
My point is if you buy Intel you have an upgrade path, even for propriety motherboards. If you buy AMD chance are you are going to be stuck with obsolete hardware much sooner than later.