Center and Mains

Thanks I'll read up on them. Lots of accolades I see.

Sure, nice! I'm already Bi-wired - Thanks I'll check it out. 

Lol thank you. Good points. I had auditioned the 8080HD and frankly (it could have been me), but it didn't even come close to making the grade. To me it sounded "thin and without body". I wish that wasn't the case, it would have saved me about $6K. Nevertheless my investment has been made so I'll look forward to Bi / Tri-Amp testing!
Thanks so much guys for offering up your experience and ideas.

Sounds in the front may come from a single speaker, or they may be created with L&C or C&R speakers, and that is a problem with the mismatch.

So the sensitivity would create a path of least resistance and push gain left or right? If I can’t change the speakers to match, can I amp up one or another to offset the effect? Maybe Bi or Tri-amp my center?
Having owned many Def-Tech speakers already, I really tried to go that way with my new center, but their centers available were not a match for the older 7000sc’s and considering the demand I was wanting ask of the center, it just wan’st going to cut it. I like the sound I have, even if it is sort of "hodgepodge".
I was watching "The Rewrite" last night and felt just "folded in" amongst a few of the tracks. I’m wanting to tweak / balance / squeeze my existing speaker system.
Side Surrounds: http://www.definitivetech.com/products/mythos-eight
Rear and Back Surrounds: http://www.definitivetech.com/products/sr-8080bp

My question is can I add power and find those nuggets or should I
forget the power and find the right processor?

The processor it is. MX122, Marantz 8802A?? 

I'm in N Alabama. I have a Marantz dealer close and have reached out for a demo. Your point about used is a good one and that's one of the reasons I've moved to separates from an AVR. Making it easier to keep up with tech. What is a Oppo?