I'm at somewhat of a crossroads deciding which one of these amps to purchase. I'll be using a Pioneer 49-tx as a pre, and it will be driving Nautilus 804's and an HTM1 up front and center, Def Tech bp2006tls for sides, and a Def Tech 2300clr in the rear. The problem I'm having now is that while I'm getting a nice wide soundstage, its without much depth, and everything sounds somewhat muffled. The Theta has five 100w channels, while the B&K has seven 200w channels. I've heard the Theta might have better depth and clarity over what I'm getting now and over the B&K, however I don't want to be under powered even though the volume hardly ever goes above medium listening levels. I've also heard the Nautilus 804's need a fair amount of power, so that has me concerned as well. Price wise I should be able to get them both for about the same. Any suggestions? Thanks in advance, Karl.