lol, sure.
Unless you mean an SLI/X-fire setup with SSDs in raid, which is really not necessary, at all, to have for most people. In other words if you want to waste a ton of money for the heck of it and for bragging rights, spend 2k on a PC.
Exactly this.
I spent $750 for mine, and I am running every game from the older stuff, to the newer/high end stuff (Crysis 1/Warhead/2, Witcher 2, etc) at maxed settings at 1600x900 resolution, with 50+ FPS.
There's no reason you'd HAVE to spend over $850 at max, unless you want to. Multiple HDDs/SSDs, SLI/Crossfire (or Tri/Quad SLI/Crossfire), Liquid Cooling, etc, will run you a few thousand dollars easy though, and systems like that are generally used for people playing in 2580x1600+ resolution and/or multi-monitor setups (and just because they can as well for some).