What computer can i use to run fallout new vegas?

Where can i buy a computer under $2000 to run games like fallout new vegas, oblivion, mass effect.What computer can i use to run fallout new vegas?
You can build a desktop for around $500 that will play all those games on High settings.

Here's some advice but you could figure it out yourself:

http://www.jonlee.ca/how-to-build-an-aff鈥?/a>