Kng, for budgetary reasons I'm going to stick with my Squeezebox Touch until it goes belly-up. Then I'll go for the bridge or whatever updated version of it might be available. I expect the bridge will sound better than my SBT due to the extra digital lens.
Regarding break-in, I'm going to be zen and take my sweet time with it! I power on the system for about 5 hours a day, so it will take me 2-3 months to accomplish at that rate. The PWD was a stretch for me and I'll live with it for a long time, so if I can get improvements over the next 12 weeks without doing anything, that's like getting tweaks for free!
I will echo what a prior poster (Vhiner?) mentioned that even a 192 mp3 from Pandora now sounds damn near as good as redbook did before. That's stunning.