First Watt vs McIntosh vs Ampzilla


I'm searching for a power amplifier to pair with a McIntosh c712 preamp and Zu Omen Def speakers. 
I want it to be melodic and clear (not mellow and round) and with a good soundstage, capable of filling my big living room (12m x 6m) with powerful party levels sound - not necessarily ear splitting levels.  
Nearby I can purchase a First Watt M2, a McIntosh MC7150 or an Ampzilla 2000 (stereo) for a good price. 
I cant audition them at home with my system, so besides my personal opinion on the sound at the different shops, what do you have to say regarding these three models? Any of them is better than the others? Better sound? Better reliability? 
Any opinions?

128x128migueca
I use a First Watt F6 with Proac 1SC. I second it for Nelson Pass amps. Class A Mosfets ,with lots of bias juice sounds incredible. IMHO.
Mg16
I use a PrimaLuna Dialogue Premium Preamp with a M2 and Tekton Double Impact speakers and couldn’t be happier!
i had the m2 with double impacts..dumbest move ever to sell it..perfection...  i also had a sit-2 and j2..allllll amazing..im about to re-buy a sit-2...the most perfect solid state amp ive ever heard...
@migueca    At this point I would have to assume that after 5 months that you have chosen one of these amps.  My Taste would lean toward the SST Son of Ampzilla 2000

Thank you all for the inputs. 
I had to put this issue on standby for a while and when I got back to it, I followed a different path. 
Bought a pair of monoblocks from Temple Audio and I'm very happy with the result. Everything I was looking for, I found it in these little boxes. They output 100W in class D and the sound - signal coming from the McIntosh C712 preamp and going to the Zu Omen Def - is fantastic! Clear, powerful, amazing soundstage at a very affordable price.