Tgrisham,
My experience is very much like yours. I am running a highly modded Jolida Music Envoy pre and a Modwright / Sony 9100ES disc player (Platinum Sig. Truth mod), Maggie 3.6s and my Murano P-1000s+ monos (identical internally to the Bel Canto and Jeff Roland models using the B & O 1000 ASP module). I have been tempted of late to do tube hybrid amps so that I have tubes throughout the system, but the more I look into it the more I realize I will probably NEVER part with my amps. Unless one spends something in the $10,000+ range for high--powered tube amps, he will never duplicate the "magic" that happens when mating a great ICE-power (or equivalent class D) amp with a great tubed preamp. You summed it up nicely...you really DO get the best of everything in terms of speed, articulation, soundstaging, dynamics, etc., AND a flesh-and-bones visceral sonic picture that is wonderful to listen to for hours on end. It is this kind of synergy that keeps the upgrade bug tamed, in my experience. By the way, I noticed that there is a HUGE amount of discussion of Class D on these forums, and for good reason!