Mike,These MC275's are great when bridged so using a pair is recommended, I Think you will love the extra weight and solidity your system would achieve. Go for it.
McIntosh Experts Needed
I am currently contemplating another MC275mkvi to run as a pair of mono blocks. I am currently using one along with an Audio Research SP20 preamp, which by the way is an awesome combination. I use small Sonus Faber Minima Vintage speakers. What will I gain in sound quality? A friend told me that I would loose some of the sweetness of only one amp but would gain a bit more punch. He said it would sound more solid state than tube. What do the experts think ?