I have the Sherwood Newcastle R771 (C$600, much cheaper down south) and really like it (also recommended by Axiom for driving 4 Ohm loads). If you need HDMI the R772 I believe is MSRP US$600.

As for Yamaha the RXV1700 at 130watts is in the $600 range.

M80s/VP160/QS8s/EP350; M22s; M3s.