Yeah but I would have to know all the parts in the system to even assemble it, not to mention the annoyences and frustrations it brings.
Then you might be better off looking at deaths_soul's post and checking out the sites for those manufacturers he suggested. Figure out your budget and then go take a look.
Check out the first post on the thread linked below for a general guide on what you need to look for when you're shopping. If you can afford it, look for something close to or even better than the
recommended specifications.
http://www.gamesas.com/topic/1350063-unofficial-will-my-pc-run-skyrim-thread-58-w-hardware-guide/
Building your own gaming PC is kind of intimidating the first time you do it, and the sheer amount of information can be overwhelming. But it gets a lot easier after putting one or two of them together, and I get a lot of satisfaction out of running a machine that I built myself.