Rackmount Gaming PC?

Just bought my first house, albeit a small one. The room i have for my computer room is about a 8x8 space. I'm looking at what I can do to conserve floor and desk space. I will be purchasing some rack-mount hardware anyway due to trying to get a CCNA Cert.

My question is, are there any recommended cases (figuring 4u) for a gaming build in the rack-mount arena? Any examples of ones that may have been built already? It doesn't need to be a full depth server case (I don't think any how). I sorta thought this would be a good way to keep it cool as well since heat rises up, and if I space it correctly (towards the bottom of the rack I would think).

As far as the PC itself goes, it's running:
CPU: i5-2500k
Vid: x2 GTX 560 Ti's in SLI
MB: ASRock Z68 Extreme7 Gen3

I will be upgrading eventually but just to give an idea of what I am looking for.
Thanks.

P.S.
I'm looking at doing a wall mounted rack or set of racks as to make a good use of space.