@orrman
Go read here. Klipsch Love or Hate, it’s all good - #12
The Heresy is one of the few speakers that can play on an MZ3 decently.
The Forte would probably sound “better” to you, personally I feel it is the speaker that sits in the “sweet spot” of the entire Heritage line for most people. Not sure that an MZ3 would be enough for them though. An MZ3 might be ok for lower volume, low level listening, it will probably sound a bit “light”, the amp is OK, and I play with it often but it’s not a particularly hefty watt. 
The Heresy is NOT for most people, and honestly I’m pretty sure you would dislike it. The MZ3 is fun to play with and every so often I’ll drop it in line as a speaker amplifier but I just could not see myself using it as a daily driver.