I would wait until Amir measured the Outlaw monoblock I sent him before deciding!
Just keep an eye on this thread:
As more people going beyond 5 channels, I can see the need for external power amps may also increase. The Outlaw Mono block M2200 and multi-channel amps, as well Monolith's and Emotiva''s seem to be the most recommended amps on this forum. For some strange reason, I cannot find my Adcom...
forums.audioholics.com
It should happen in 2 to 3 weeks and may reveal a weakness or that Outlaw underrated these amps.
I believe the Monolith has been measured (it has here at AH, but I don't think the monolith 3 configurations has been measured yet).
You might give Outlaw a call to see how long the sale will last.
I have a Monolith 5 that has a kind of loud transformer(s). The Outlaw 2200's (and m200's) are good and quiet, so I would go with the Outlaw based on that, but YMMV!