Onkyo TX-NR616 7.2-Channel THX Select2 Plus Certified Network A/V Receiver(Black): Electronics for $312.78 + free shipping
Eligible for Amazon Prime or free super-saver shipping.
3D Ready, THX Select2 Plus Certified, Audyssey DSX.
Might just be a short-term Amazon price drop, as they sometimes are, so I don't know how long it will last.
The TX-NR616 is a lot of bang for the buck, especially considering that fairly recently the 515 was selling for more than this price.
There are some negative reviews, but those were largely from before the very recent firmware updates that made a big difference (or from people who don't have the sense to update the firmware immediately, before complaining about issues that have already been fixed).