Was wondering what a good amp would be to add to my yamaha 1300 receiver for music? Have syudio 20's as mains, servo-15 sub.I also use this setup for movies so 50/50 music movies.Just think i could get the music to sound alittle better with a stand alone amp. Been looking at NAD,ROTOL, what are some other good amps? what kind of power should i be looking for? I have about $300 to $400 to spend is there any good ones out there for this?