Deuce,
I just sold my Ridgid 12" (nice saw BTW) and bought the Makita 10". I sold it for the exact same concerns you have - too big. In my case I had a problem mounting the beast in a built in miter saw station. However, I would never have entertained the idea of bringing it up and down stairs.
The Makita is much lighter, and unless you are planning on doing a ton of huge crown molding or baseboard, the smaller saw will be just fine.
As far as a stand goes, check out the Ryobi one at HD. It is $99 and plenty sturdy enough for the 7.5" Makita.