Looking forward to seeing how you like the shifting and performance of the Nexus hub bike that you try.
I like being able to shift while at a complete stop. Sheldon Brown though (see article posted earlier) recommends not applying pressure to pedals while shifting, to minimize, which in practice is hard to do when climbing.
I'd love to eventually get a 2nd commuter bike for fun fair-weather use and use the Breezer for bad weather duty, or commute with it if the forecast calls for 10% chance or more of rain. Something like a Space Horse, Tamland, etc. So I'd be going kind of in the opposite direction of the OP.