Despite the 2-channel bias this site tends to have (me included), I can certainly appreciate the benefits of watching movies on a decent 5.1 system. Toward that end, and considering your speakers, you could easily get by with a Yamaha RX-A780 AVR you can get from accessories4less.com for only $550 — and, frankly, your speakers don’t warrant spending much more than that anyway IMHO. It can do 7.2 or ATMOS if you ever decide to go that way, and as your speakers are 90dB efficient it has enough power to drive your system (especially since you have a subwoofer) and will likely sound better doing it than your current Pioneer. Yamaha also has the distinction of producing the most reliable mass market AVRs so you should be good to go for another 10 years if you so desire.
If you have the itch to upgrade your system you can look at the RX-A2080 at $1299 (from the same store) and look at the SVS Prime line of speakers for a significant upgrade in that area as well without breaking the bank. Anyway, hope this helps and best of luck in your search.
If you have the itch to upgrade your system you can look at the RX-A2080 at $1299 (from the same store) and look at the SVS Prime line of speakers for a significant upgrade in that area as well without breaking the bank. Anyway, hope this helps and best of luck in your search.