I'm using an Audio Innovations Series 500 integrated, fitted with Genalex Gold Lion KT77's, 6922's (phase inverters), and 12AX7's (one line driver, and the other two for the phono stage).
I place a lot of importance on the '500. All the other integrateds I've owned over the years just couldn't achieve what this one does, particularly with regard to what I would call a "full-bodied" sound; and since we're talking about depth I would say that this is the only one that made good recordings sound as if they were spilling out into the room, rather than just laying flat, as if painted on the wall.