There are computers for under $550?
Well here's a good plan to do if you want a really good computer for gaming. Save up your money. I saved up probably 3 years worth of Christmas money (Mainly because I'm a picky person and don't buy much)
Go for an Asus. It was a lot of money but trust me, so worth it.
This Asus has over 900 GBs. The graphics card is awesome. Like on the side says "Intel core i7" (i7 brands are the best for games supposedly) And then there's 8GBs Ram. So if you're willing to actually do this trust me its so worth it. It can play SKY RIM on HIGH QUALITY! Without lag or anything. It's a good computer and really worth it.
However, if that's not your cup of tea, then go with a Toshiba. I've had mine for a long time and I absolutely love it. They're durable too. I've dropped mine a lot XD