There is a fellow Audiogon member that has a very long post regarding your question. He purchased and/or demoed the expensive integrated units including the Gryphon Diablo 300. I believe he ended up with a Pass Lab Integrated 250.
If I find the Audiogon Forum I'll post it for you to read. Should you other guys know of what I'm thinking of please post it, I don't have the time to find it, I have to head out for a 5-hour round trip.