Help with a receiver for my RTA 11 series speakers

Dear members,
New to this forum. I am looking to upgrade a receiver for my RTA 11 big boys. (front speakers). I currently use SONY STR-DE series receiver. I am a die-hard Costco fan, I see a Yamaha TSR-7850 for $489 to set up in my 22x20 basement.
I am planning on getting a CSiA6 centre channel and a Polk PSW 505. I deeply appreciate your thoughts. It's been a long time since I followed Receivers after getting a BOSE and Onkyo system for my other TVs.

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