Need a decent, affordable gaming computer?

So, I have primarily been a console kinda guy for pretty much my whole life. I've come to terms with the fact that PC gaming is superior in most if not all aspects. I don't want a gaming computer that looks like something off of terminator, I just need something that can play games without getting the infamous blue screen of death. I'm a 16 year old guy in high school and summer's coming up. I'm planning on getting a job at a restaurant or shop at the strip mall across the street from my neighborhood. In addition to that, if I follow through with this, then I will most likely sell my PS3 and the games for it. Assuming all goes well with that, I can probably get around 400-450 for the console and all the accessories/games. Like I said, I don't need a supercomputer. Probably the only games I will play on there will be Minecraft, Team Fortress 2, and Skyrim. I'm planning on getting mods for both Minecraft and Skyrim for sure so it will need to be able to support those. I would like the price to be low, as far as gaming computers go anyways. I'm new to the whole PC market thing so ignore the budget part for the time being. This is not an immediate thing. I just want a general idea of what is available. It doesn't even have to be a gaming computer. Just something strong enough to support those 3 games.