Does your child always want to use your PC? Is it time to build him his own? If you don't trust the tier-one vendors to sell you a well-balanced machine, you'll be happy to know that you can piece together your own entry-level box for less than $450.
You don't need a massive case to cram in tons of computing muscle. With a little help from a few manufacturers, our excessively-overclocked GeForce GTX 580 SLI build is small enough to sit atop most desks (and smoke our $2000 SBM machine).