Building a Computer?

[Shannacore]

Wondering around how much it would cost to build a computer that could run several of the adobe suite programs (At once, usually), and would have p. good graphics for gamez and such.

I don't need/want/can't afford a leet machine, but I am really sick of having to rely on campus computers because my laptop won't run the adobe suite well.

Any thoughts? Are pre-built machines really that bad? I'm not very techy so I assumed that would probably just be the easiest way. If so, any links to any machines?

thx thx thx.