Good Stuff Randy.
Im also in the middle of building a system, old school though.
I thought about getting an A5 3 channel amp, but I decided to get a 4 channel ESX Quantum Q120.4. One of the most versatile amps ever made (only 1 year in 1997) It's actually built by the legend Stephen Mantz @ Zed audio.
Very Highly Sought after amps by Germans and Italians.
Just made a thread here about my install consisting of the legendary Alpine 7909, ESX amp, Kicker s10c solobaric sub , Kicker R6 mids and nd25a tweeters