Need your recommendation on a 5 or 7 channel amp

I'm new to this site and need some recommendations on 5 or 7 channel amps. My current home theater system consist of the following:

Amps that I'm looking at are as follows and would like some input which to get or other recommendations:

Thanks for your help!!

singere10-15-2021 9:46pm

singere OP Details Discussions Posts This discussion Message User 25 posts 10-16-2021 at 10:26am Copy Comment URL Report Comment Edit Delete Thanks for the detail information - very eye opening. I will look at the ATI amps.
singere OP Details Discussions Posts This discussion Message User 25 posts 10-17-2021 at 04:55pm Copy Comment URL Report Comment Edit Delete Thoughts on the 1827 versus 4000 series?
singere OP Details Discussions Posts This discussion Message User 25 posts 10-19-2021 at 10:46am Copy Comment URL Report Comment Edit Delete I can get a pretty good deal on the ATI4027 @ $3960 and the ATI1827 @ $2400, but with out previewing either one which would you prefer? Sonically will I really hear the difference between these and with a $1,560 price difference do you really think it's worth it, or should I entertain an ATI 4023 for the front 3 speakers and an ATI 1824 for the rears and Atmos speakers predicated the cost is the same as the above configuration as the ATI 4027? Buying with out previewing is my biggest concern. Thanks!!
singere OP Details Discussions Posts This discussion Message User 25 posts 10-21-2021 at 10:18pm Copy Comment URL Report Comment Edit Delete Ordered ATI 4007 amp. Will let you know when I receive and how it works in my home theater. Still waiting on the Marantz AV 7706 processor - think it comes in end of November. Thanks again for your input !!