intel cpu's are faster and AMD cpu's are cheaper, or a better value, generally. If you are gaming, you can get cheaper, but slightly less performance from an AMD cpu/mobo combo and put the money saved towards a faster GPU. There's a little bit of overlap between some of the bottom end and middle, but at the top end its intel. That makes me sad.
This is probably a better explanation than what I said about never going AMD. I have never made an AMD build and I have not owned an AMD chip, but most if not all of the people I know who are very computer savvy say go intel if you can afford it.
The i5 3570k on sale at tiger direct that eshepard linked you to is a great deal. I would jump on that ASAP. I have that chip in my uber gaming rig and it is considered the sweet spot for gaming with high OC potential. I run it stock and it is great.