The one at the Modeltrainstuff link looks a lot like one that is available at a similar price from Micro-Mark. IMHO it's too small for 0 gauge - you can fit a boxcar in there but not a locomotive of any size.
Paasche makes some nice paint booths, but they cost quite a bit more. Chicago Airbrush is a good source for Paasche. I bought a Paasche VLS airbrush and some accessories from them a while back, and the guy I talked to on the phone was very knowledgeable and helpful.