I need a good gaming budget computer!

For $500 you want to be able to find pretty much anything to play modern games at high settings if you aren't willing to build it yourself. Even then, thats asking a lot.

Your best bet is to turn to eBay and Craigslist and see if you can get a decent used gaming rig cheap.

However, seriously consider trying to build. I built my first when I was 14. It's really easy to do with a bit of research and there are a ton of guides on how to do this. A ton.

Here's an easy guide real quick with my own substitions are the same prices.

http://www.maximumpc.com/article/features/build_a_500_p...

Video card, 6850 instead of 4870. http://www.newegg.com/Product/Product.aspx?Item=N82E168...

8GB of RAM instead of 2GB. http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Intel Core i3 + Motherboard http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...