1. I bought my BF a kegerator off of CL and he says it was the best present I ever bought him. If you haunt it, you can find True and BA units around $500. We got one of the "good" haier units.
2. The unit we bought was a single tower. I bought a dual faucet tower on eBay and the upgrade is "so easy a girl can do it"

Some people have talked about making the hole in the top bigger, I didn't because we don't have the fan tower cooling rigging.
3. The unit will hold one 1/2bbl, one 1/4bbl, one 1/4bbl (tall) and one sixtal, or two sixtals. We get Lord Chesterfield which comes in tall quarters and a lot of the micros come in sixtals. We don't know if it will hold 2 quarters since we havent' found anything else that comes in tall quarters.
4. You will either need a splitter or a
dual regulator for the two beers.