Just some friendly advice... there is absolutely no need to buy an AVR from Best Buy or any other retail store and pay full retail price. Its all the same dude. Except you get it for a fraction of the price online. For example, at your $500 budget, you'd max out at the AVR-X1000 or the Denon AVR-E400. You could step up to the Denon AVR-X2000 by buying online. < $500 online vs. $650+ "retail".
With that being said, people will respond with "make sure you buy from an authorized reseller or you won't have a warranty"... Ok, but keep in mind:
1) You can still find the X2000 online from an authorized reseller for around ~$500.
2) This is electronics. They don't "wear out" or "break". I've had AVRs for 17 yrs+ and have never had one break or fail in any way. My dad had the same Sony AVR (low end one) for 10 yrs and it still works 100% to this day, but he finally upgraded a month ago.
3) Lets say your AVR did break a year from now. Now what? Your $500 AVR is worth about ~$250 if you were to sell it a year from now (if it worked perfectly). If you wanted to collect on your warranty, you'd have to ship the AVR to New Jersey and pay shipping both ways. Assuming you don't have any discounts, you are probably going to pay $70 or so. Now you are at $180 and you'd be without an AVR for 4 to 6 weeks. It would make more sense to just throw it out and get a new one. Even more so if it broke 5 yrs from now.
Anyways, the point is, $500 AVRs are not worth repairing under warranty as stated above. Even unauthorized resellers are going to cover DOA swaps. If it works when you get it, assuming you don't short it out (which the Denon warranty wouldn't cover anyways), it'll work pretty much forever.
My advice would be different if you were going for a higher end model, but at the $500 range, I wouldn't really concern yourself with the warranty and just go for the lowest price you can find.
Peace of mind is great, but it doesn't play out in the real world all the time