Prices are a bit inflated because of scarcity, so some temporary options may be 'expensive'
If you have a 5.1.2 setup (7 speakers, 1 sub) you may not need/want the higher-end Audyssey XT32 room correction of the more expensive models (SR6013 or higher/newer) until you're ready for separates.
You may want to check out accessories4less.com for refurbished receivers.
If you're OK with Audyssey XT, the SR5014 is available $200 under budget. You could even get away with Denon cousin AVR-X1600H $300 under budget, and it includes and extra 3rd party warranty.
If you want the Audyssey XT32 room correction, the SR6014's available refurbished $200 over budget, and its Denon sibling AVR-X3600H is $100 over budget.
Those prices seem 'reasonable' or even a value. The SR6015 is $550 over budget there. Denon sibling AVR-X3700 $300 over.
Depending on your room setup and power needs, you may want to save some money depending on when you think you'll get to separates.
If you can bear it, you could go downstream even further. If you're a Costco member or know someone who'll buy there for you, the Denon AVR-S750H and Yamaha TSR-700 are available at half your budget and can power your 7 speaker, single sub system, while giving you a little bit of a head start towards separates from the savings. Given Costco's generous return policy, it's not much of a risk to try and see for yourself if either can hold you over.
If you have a 5.1.2 setup (7 speakers, 1 sub) you may not need/want the higher-end Audyssey XT32 room correction of the more expensive models (SR6013 or higher/newer) until you're ready for separates.
You may want to check out accessories4less.com for refurbished receivers.
If you're OK with Audyssey XT, the SR5014 is available $200 under budget. You could even get away with Denon cousin AVR-X1600H $300 under budget, and it includes and extra 3rd party warranty.
If you want the Audyssey XT32 room correction, the SR6014's available refurbished $200 over budget, and its Denon sibling AVR-X3600H is $100 over budget.
Those prices seem 'reasonable' or even a value. The SR6015 is $550 over budget there. Denon sibling AVR-X3700 $300 over.
Depending on your room setup and power needs, you may want to save some money depending on when you think you'll get to separates.
If you can bear it, you could go downstream even further. If you're a Costco member or know someone who'll buy there for you, the Denon AVR-S750H and Yamaha TSR-700 are available at half your budget and can power your 7 speaker, single sub system, while giving you a little bit of a head start towards separates from the savings. Given Costco's generous return policy, it's not much of a risk to try and see for yourself if either can hold you over.