I've been working with a Panasonic system since they first came out, first with a G1 (since passed on to my son) and currently a GH1 and a GF1. The 14 will be a perfect complement to the 20 and the 45 primes with the GF1; You can walk around all day with that system in your pockets. As an all-around shooter, I think the GH1 is terrific -- I love the twistable LCD - and will upgrade to the GH2 as soon as it comes out (and my son gets another gift.) As somebody who grew up with ASA 400 film, a clean 1600 seems almost miraculous, and with an effective 16mp sensor, I really don't think I need much more -- I'm getting to the point where I may not buy much more equipment. (Yeah, right; pass the joint.)
I used to travel a lot internationally with a Nikon system, and it was always a terrific pain in the ass. I just don't feel like being a burro anymore. I not long ago got a green nylon Pelican case which can taken an entire Panasonic system (2 bodies, five lenses, chargers, accessory viewfinder for the GF1) with space for a laptop (the Mac Air fits just fine) plus personal papers, extra glasses, etc. -- and it is, to all intents and purposes a *briefcase.* And not a huge briefcase. With the Nikon system, I needed a roller case, and sometimes had to check it on regional airlines. I really don't use the Nikon much anymore. For my uses, I'm better off with the low weight than any extended functionality.
Your review of the GH2 is much appreciated; I'm gonna get one.
JC