You guys should build your own.  Its a great project if you have kids and the hardest part is managing the wiring so that your system can breath.  Seriously.  It was a lot of fun for my kids and I to build the one we have.  Fry's sat the chip for me because I didn't wanna screw with it and off we went.
Lotta fun and NOT difficult.  If you can ask questions and use Google, you can build one...and I real good one.