OK boys an girls im thinking of upgrading my amp to either the Pioneer A4x or the Sony 5200. At the moment ive got the Harmon Kardon AVR 30. A good piece of kit but id like hdmi switching. My question is is it worth the expense will any of these two amps blow mine out of the water sonically. Or am I better off saving my money and buying a swith box. Any comments please Mike.