Just FYI: I paid $100 for my BA-115 off of Craigslist, but it's the earlier model. (It was missing a couple of knobs that cost me $2 apiece to replace.) There's another one currently listed for $150; others have been listed recently for $200 and $175, but they don't appear to be moving at that price. In fact, I think the $150 one has been reduced from a higher price.
I haven't had a chance to hear or play on the new generation of BA amps, but I like my old ones well enough. A BA-112 is what I usually carry to jams or practice...it's plenty loud enough for what I do. And the form factor of the new ones will work better if you're planning on stacking them, which is what most folks would recommend. One kind of cool thing about using two complete amps is that you'll always have a backup with you.
Edit: On the other hand, you'll be schlepping 90 lbs. of amp around.
If you do go ahead and get a second amp, post back up and let the TB community know how it goes. Happy pickin'.