As far as my favourites basically part 14 through to the end is a tour-de-force. It's hard to top part 16 for the sheer emotional weight it carries though. But then part 1 & 2 plays so well as a stand-alone Lynch film I could easily pick that as well. Especially the memory of watching NEW Twin Peaks for the first time and not knowing what the heck we were in for was pretty damn incredible.
Part 11 really does have a bit of everything which makes it really representative of everything that makes this season what it is.
I just finished re-watching it today actually. All the crazy stuff in the last 2 parts makes way more sense after having seen the whole series again, having read the books, having thought about it for months, and having read lots of articles and analysis and stuff. (good lord, the time I've invested into this damn series haha).
Onward to the bonus features!