I have owned Acurus pre/pro and amps, and I have recently upgraded to the Aragon Soundstage pre/pro and Aragon amplifiers(via Audiogon). In the process of purchasing these upgraded Aragon electronics, I have read a lot, listened a lot, and talked with several very reputable dealers.
You have a difficult decision to make. Because you listed 50/50 music & movies, I am assuming that you are looking for a high quality 2-channel analog pass-through and quality surround processor in one unit. This is one feature that separates the average pre/pro from the really good one. All three of the units have excellent 2-channel pass-throughs. If cost is an issue, I would rule out the Krell because I think you can get almost as good (this is debatable) for half the price. ONE KEY POINT, the Aragon Stage One is NOT balanced. The Aragon Soundstage is balanced. I have heard very good things about the Integra for 2-channel, but I have never listened to it.
I might have an Aragon Soundstage (balanced) for sale. Call me if you would like to discuss. (937) 609-5285.....