I have a pair of the Sennheiser HD-595's. Since I work nights most of the time my schedule has made these headphones a necessity on my days off. I've watched many movies with these things on my head and yes, the Dolby Headphone feature works remarkably well.

But do yourself a favor, take bestbangs's lead and go out there. Gather all the information you can and test drive what you can.
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Living Room: Outlaw 990-7125. 3 Outlaw LCR's (FL-C-FR). 2 Outlaw Surrounds. 2 Outlaw BLS in the rear. Outlaw LFM-1 Plus Subwoofer. TCL 65 inch Roku TV. OPPO BDP-83.

Bedroom: Marantz Cinema 70S. Aperion's all the way around. Apple TV. HTPC built from scratch.