got the upgrade bug.looking to replace my rotel ra 05 amp would the omkyo a 9050 or denon 720 ae be only a sideways step.i use a denon 3313 blu ray player for my source using the dedicated rca outputs.speakers are acoustic energy neo 3s floorstandings.what amps would anybody reccomend music taste heavy rock/metal so a good sounding bassy amp not bright treble would suit.looking to spend about £500-£600.