I currently run a sony ES pre-amp from the late 80's (better stuff then IMO) and a Kenwood 150wpc amplifier from the same era. I wanted some advice on what brand or type of amplifier may be better sounding that the old kenwood, it sounds good mind you, but looking for something a little cleaner and more reknown. My mains are AR 318PS tower speakers with 91db sens 1w/1m. I was looking at a yamaha m-60? any good? thanks for any advice.