I have found,in my limited HT experience, that a speaker system from the same mfg. blends together more seamlessly.Just my thoughts.
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Paralysis by analysis?
First off Id add or step up to the new electronics and see how they work with whats on hand.
One move at a time is also a more insightful way to predicate decisions. Its easier and simpler too.
After that consider the needs of the newly proposed speakers if any are then still desired/needed.
Adding speakers to amps is a key thing to do and certain parameters need to be addressed and satisfied. Following that your preffs and budget will determine which are the ones you can get.
Staying in the same makers ball park for HT is a very good idea. Of primary importance is for the front 3 to be as cohesive as possible. Surrounds could be moved in & out from other lines if necessary. The info there is getting better but its still ambience more often than not.
I couldn't agree with Tpreaves more. The only way to achieve a good balance with timber and audio transition from front to back or sides to front is to operate with the same speakers. I would go even further and say all the speakers should really be the same speaker.
For example, I'm using monitor audio GR20's for my fronts
GR10's for the rears, GR center, GRFX for the sides. They all have the same 6.5" driver and 1" tweeter.