Have you heard Dolby ProLogic II (included with the 950)? It's actually a digital version of a Fosgate DSP mode - works wonders on stereo, Dolby Surround, and Dolby Pro Logic soundtracks. May be all you're looking for.

I'm in a somewhat similar situation - upgrading from a Yamaha DSP-A1, which is also known for unique 70mm surround modes, but it actually uses a second set of front speakers for ambiance - really makes your room sound like a bigger theater. I've noticed, though, that more of my favorite soundtracks have been mastered specifically for surround, and the added "ambience" messes them up. Specifically, anything animated (from Pixar, Nick Park, or George Lucas) tends to have the surround sound dialed in just so. This finally put me over the edge, and I've just ordered a 950/7100 combo, hoping straight Dolby Digital and Dolby ProLogic II will be "good enough" on their own.

-avi