I have been fairly satisfied with the basic logic used by the Oppo players, but I'm leery of suggesting one option as inherently better than another without all the facts. Are you connecting via analog or HDMI? If it is analog, what processing options are available in the player? If it's HDMI, you probably have Pro Logic IIx available, and I'd feel pretty good about using it. Whether it's "better" than the straight 5.1 is hard to prove either way.

Since I haven't been buying many Blu-rays, I haven't been watching the release news closely enough to know what's coming. I bet there are some sites - and possibly even a thread or two at AVS - that track that, though.