Igniq's Gary McKeon priced the various components he would need to build a top-of-the-line gaming rig. With a quad core 3.07GHz processor, beefy graphics card and loads of RAM, his PC clocks in at just under $2,400. Not cheap, to be sure, but an Alienware PC with similar specs would cost nearly twice as much at over $4,600.
The lesson here: If you need the best gaming PC around, you can save a lot of money by building it yourself (or finding someone to do it for you). Unless you just need a little alien head on your PC case, of course.