For that size listening area I think you're shooting 'way too low with the Outlaw. I have a similar-sized listening area, and I'm real familiar with the "voice" of the Concerto Grand Piano. I had an Outlaw RR2150 and sent it back. It was lacking compared to what it was supposed to replace--a 20-yr-old pawnshop stack of Amber electronics. It's possible that the early run of RR2150s had some issues that were later addressed, but I worked really hard at breaking it in and it simply didn't "cook" for me.
Now I use the similarly-priced and powered Onkyo A-9555 integrated amp and I personally find it infinitely better at powering my small column Mirages. In fact, I've found that the Grand Pianos have a similar tonal balance to the Mirage and probably sing best with a similar amp. Both are narrow columns with small ported bass drivers. I recommend either a good switching amp--the Onkyo might do but a NuForce or PS Audio would be even better--or a good old-fashioned high current amp. The 150 wpc Vincent SP-331, but you'd also need a preamp. For an integrated, the 120 wpc Cambridge 840A might be a good match. Normally it's $1600 but this sale or closeout puts it within sniffing distance of the Outlaw and it's MUCH better. The NAD C 355BEE should be a contender as well.
Now I use the similarly-priced and powered Onkyo A-9555 integrated amp and I personally find it infinitely better at powering my small column Mirages. In fact, I've found that the Grand Pianos have a similar tonal balance to the Mirage and probably sing best with a similar amp. Both are narrow columns with small ported bass drivers. I recommend either a good switching amp--the Onkyo might do but a NuForce or PS Audio would be even better--or a good old-fashioned high current amp. The 150 wpc Vincent SP-331, but you'd also need a preamp. For an integrated, the 120 wpc Cambridge 840A might be a good match. Normally it's $1600 but this sale or closeout puts it within sniffing distance of the Outlaw and it's MUCH better. The NAD C 355BEE should be a contender as well.