Need Amp Advice

Hey guys,

New member here but music lover for many years.
I am looking to upgrade my amps to get better sound quality and really need some help. I watch movies and listen to music daily. I would say in general, 70/30 (movies 70). I run a 5.1 setup and plan on upgrading to 7.1.4 in the future, but happy with 5.1 at the moment.
When I listen to music I only use the 802's (no sub and no multichannel music).

Currently, my setup is:

Speakers
Main speakers: B&W 802D (first Diamond)
Center: B&W HTM2D
Surrounds: Klipsch
Sub: Klipsch

Pre-amp
Marantz AV8802A

Amps
Emotiva XPA-1 monoblock x2 for the main speakers 
Emotiva XPA-3 Gen 3 for the center and surrounds

The sounds is good, it's actually more than good but I want it to be even better. I have been looking at many used amps (can not afford new ones) and wanted to ask for your opinion on the following that I have considered. I have not heard any of them with my speakers.

1. Classe CM-A600 monoblocks 
2. McIntosh MC501 monoblocks
3. I even looked at the Devialet 200 which was recommended by someone I know
4. Krell?

Do those amps make sense? Am I looking at a noticeable improvement over the Emotivas? I would love to hear from people who know and heard those amps, especially driving 802's.
I am of course open to any other suggestions as well.

Thank you in advance!