First of all, have to say that I am liking your taste in gear. (I'm running a qb-9, Rowland preamp, and Rowland 201's on the stereo side.) So, cheers that.
Substantively, if you want to play blue ray, you'll need a blue ray player, no question there. By all accounts, the Oppo's swell there. So that makes perfect sense to me. As for the processing end, always thought that the Classe (not to mention the 15-year old Marantz AVR I'm using) dos DTS and Dolby just fine. If there's a new codec/version that one needs new gear to use, it's news to me. (Not for a moment asserting there ain't, just hadn't heard of it). So if there's a new codec that's HDMI-only, there you go.
Personally, I run HDMI from each of my Oppo (DVD, got it before they came out with the blue ray version, or I'd have that) and the cable box, directly into the monitor/TV. But, use this for video only. Audio goes into the AVR via optical. Way I see it, there's no reason to run video switching through the AVR/processor -- it has nothing to add -- so might as well head directly from the source to the display for video. So, video is perfect for HDMI, but there's no reason (in my book) to route HDMI through the audio processor. It works for me -- but, of course, if there's a new codec that's HDMI-only for audio, and thus of no use to the Classe, then I'm clearly behind the times (which, I suppose, would be nothing new).