Many units can be broken down into two separate pieces. The base, and the screen. You will want to check on specifics of each model, and consider paying for delivery so some big ol' delivery guy has to deal with your steps, not you.
You can pick up a A/V equipment rack here:
http://www.racksandstands.com
or at your local Best Buy/Circuit City and furniture stores.
Mitsubishi is one of my favorite CRT companies personally, and the bang for the buck from CRT is great... But, the size? Yep, you know what sucks about CRT already. It's still fun to have it around, just tough to get it down the stairs.