Dude, I wish I could make your life a little easier by telling you to go pick one up at your local Wal-Mart, but I had to look high and low around the Bay to find one like this. I looked on craigslist almost everyday, went to a shit load of furniture stores, stopped at every yard sale I crossed. This one had only had one owner, came from an old hotel that was begin remodeled. I bought it from a guy that owns a used furniture store that I found one day that I got lost while trying to take a shortcut to the Oakland A's game. Never made it to the Game, I saw the sign and slammed my breaks. It's very heavy cause it's built like a tank which makes it almost sound proof.
I recommend you keep your eyes peeled and stay alert. Always take a measuring tape, pen and paper when you go hunting for one. Don't sacrifice if you really care about aesthetics or really want it stealth. Find one that fits your situation. And I would not buy any expensive components until you have your cab. You will need dimensions and measurements before you engineer these bad boys to take advantage of all your space. Plus it helps to have it in front of you so you can visualize your final result.
Hope this helps.