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
Post removed 
The McIntosh will give you a slightly mellow sound, the Ampzilla is a powerful and excellent sounding amp and the designer was one of the Audio greats. The First Watt are low powered Class A amps.  Never have heard the First Watt, I would go with the Ampzilla, and this is coming from a Mac guy. 
Given that you have those Zu speakers, First Watt is definitely the way to go.