I prefer Yamaha both for reliability and sound quality. You can find great deals at accessories4less.com on both Yammy and Denon.
Probably the best sounding AVR in your price range would be a used Anthem like this MRX 720. It’s one generation old but a step up from the mass market brands.
https://www.usaudiomart.com/details/650037292-anthem-mrx-720-4k-112-channel-receiver-atmos/
Hope this helps, and best of luck.