You might want to consider taking the pre-outs from the yamaha to an external amp. For 500 you could get a pretty nice 2-ch amp, then eventually add a similar quality preamp. If you are patient, you might find an Aragon 4004, McCormack DNA .5, Anthem 1, Bryston 3B, etc
500 to spend on int.amp,help me match with gear.
Currently using Yamaha RXV1000 to power PSB Alpha A/V (6ohms)with Music Hall MMF CD25 connected to 5.1 inputs. Current set up sounds a little harsh, and I like a smoother sound. AQ Diamondback ics, Monster Original speaker cables. I also dont want to mess with tubes. Would consider used SS stuff. Thanks for the help!