You have some sweet equipment there. I would exchange the 950 for the 1500 units.
I truly believe you will be pleased with it acoustically, and well as functionially, especially at $800. I believe you will realize a not too subtle enhancment to your overall system.
Parasounds are nice amps and you are feeding some very fine speakers. But B&K amps could smooth or warm up the sound if only a tad.
2 channel sound can only be an improvement not to mention the digital processing will open a new world to you in HT.
No, it may not be on par with a McCormack, Tag McClaren, or Lexicon for sure. I don't think it will be that much of a step down from a B&K 50.
I would carefully read the comments here.
And make sure any negatives to the 950 are things you can live with, such as the variance of input levels when selecting sources, etc. They are a few 'nusiances' not really problems. But you be the judge.