Stable Rackmount System

[dijjital@gmail.com]

A hardware question for you guys. I'm looking for a stable small form-factor, rack-mountable, powerful computer system to run Madrix in a pro scenario. Normally I'd just max out an Alienware Alpha and call it a day, however this installation will be going into a project where everyone will be expecting to see rackmounted media servers. I don't want to show up to the party with a gaming micro-computer bolted to a rack shelf
What high performance rackmountable system would you guys recommend?

The project will be a 2D linear installation of over 100 Universes. So pretty big. Don't want to skimp on the GPU...

LMK!