So, anyone going to get me a stuffty computer that can barely run anything and then every little piece to upgrade it for the next few years? 
Or can I just put that money toward games on my cheaper console with graphics that don't loving matter to me as long as they aren't terrible, which they aren't. They're good. Maybe you can have better on PC, but they look fine anywhere possible.
But really: Go to Newegg and find me a good pre-built that's cheap as forget. I can't build a computer, I don't trust touching those things and tryign to figure out where they go, potentially breaking stuff. Not everyone can do that.
stuffty computer? A $300 computer will work perfectly fine for Portal 2. It could run it on medium or so with a nice frame rate.
Also, if you ever actually get interested in building a computer, there's some pretty nice tutorials on YouTube going step by step showing you how to install parts. Also, some parts are pretty damn durable. They're not as breakable as you think. Make a topic with your budget and explain what you want a computer for and I'm sure people will help you pick out nice compatible parts. It's honestly not as hard as you think, man.
I heard that before, barely knew what it meant, forgot now...
Overclocking is where basically you speed up the parts of you computer for better performance, but it takes a toll by potentially overheating your parts. So you need (in some cases) very nice cooling to cool it down. Overclocking is not needed at all in most cases, unless you really want to get the bang for your buck, I guess.
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