The 565 or the 568 would be a step up. The 565 does not use the windows based software and set up is cumbersom from the front pannel. Also, it only has 1 digital coax, 1 digital optical and one analog input. Your system must be very simple, or you need to add a 562V for more inputs. There is one listed for 500 bucks. You could try it and sell it for little or no loss. The 568 has it all, but it's spendy. Mail me if you have more questions. I have never played with Krell processors.
Stewart
Stewart