ANything beat onkyo for ht receiver $500?

I have the TX SR-605 and it sounds amazingly natural and musical from bottom to top and the dynamics are fantastic. I can't really fault it except that it runs a bit hot. I doubt if any receiver under $1000 sounds noticeably better. Can't comment or compare the more recent SR-606 as I haven't heard it.

The HK AVR247 is cleaner and more neutral sounding, IMO. Also, better current deliver historically on the HK's. It's a consideration. Also, companies that mod them available.
Good luck

HK's have great sound for the money, but their reliability has been lower than the Japanese brands. Onkyos are pretty good for the money - you can get a new Onkyo TX-SR706 for under $500 on Amazon. I assure you this machine will sound good.

If you get an Onkyo, be sure to set the listening mode to "Direct" instead of "stereo" for all serious two channel listening. This makes a VERY BIG difference in the quality of the sound.

And yes, Onkyos run HOT, but that seems to be within design parameters for these receivers. To be on the safe side,allow room above for air flow and use in a well ventilated space.