Dear all, after some recent advice on here I have decided to go for a pair or Monitor Audio Radius 90 speakers and the Radius 200 centre. I am also replacing my receiver (currently I have an Onkyo 508). I am looking at the Yamaha 675 or A1030 or Pioneer SC-LX57. Obviously the 675 is considerably cheaper which is a plus but I am really interested in sound quality and quality. Is it worth splashing the extra cash on the other models? If so which one? I am particularly concerned with the ability to control and moderate the volumes of explosions and special effects and boost and increase the clarity of speech. Do these units offer these features?