I have a H/K AVR 525 that has been demoted to a dedicated pre/pro with a B&K 7270 7 channel amp. Obviously, the two don't compete against each other but I am considering an upgrade to the ref. 50. On paper, I really can't justify the upgrade as the the H/K handles my needs pretty well at the present moment. Would I notice a dramatic difference in sound quality between the two units from a pre/pro perpective or would I better off just saving my money? Any advice would be appreciated.