John,
Did you have a chance to hear the Ref 50 yet? I'm hoping to get better 2 channel and 5.1 sound from the Ref 50. I will be testing the Ref 50 on Monday so I will have a better idea then. The Ref 50 has a more flexible crossover setup, balanced inputs,and I'm pretty sure it allows you to have different speakers settings for different inputs. The Ref 50 also has a room equalization feature, I personally cannot comment on how well it works but many owners seem to think it's a great feature.
Kevin,
DPLIIx is not a big deal for me, 7.1 is nowhere in my near future. I do not believe that B&K is planning to offer a PLIIX upgrade anytime soon.
P.S. It's not even offically winter yet and Long Island all ready havd between 14-18inches of snow! (It's actually great Home Theater Weather

)