New or Used Amplifier

I would look at odyssey and emotiva amps for home theater applications.

Thanks guys
Looks like it time to audition amps
Joe

Although I am using all Genesis Advanced Technologies Speakers ( V and surround sound) I would be afraid the tonal difference between two manufacturers of amplifier would be somewhat obvious. I assume it could be a distraction and you may lose the harmony within the system. From your experience, would these two amplifiers play well together?

Although an older amp, the YBA 2 always seemed to be a very musical amplifier to my ears. Are today amplifiers that much better than older quality equipment?

No Response ?
1) Should L/R Main and Center/Rear amplifiers be from the same manufacturer for tonality/harmony.
2) Would YBA2 (center/Rear) and Modwright (L/R main) sound well together?
3) Are todays amplifiers that much better than older YBA 2 quality amplifiers?

I am new to surround sound, so does anyone know where I can get information (setup/equipment/ect) on what is involved in combining surround sound without compromising 2 channel sound.

I have different amps running my surround sound; I have tubes running main left and right and solid state running all the rest.I don't think the amps being different is a major concern but the center channel speaker matching the front left and right is of importance.
I would also buy used just do your homework on the gear you are considering.
I do not have any experience with YBA but do know it is a step above.
What are you considering thus far and what speakers as well?