GH2 or GH5 for a general walk around and travel camera

A GH5 doesn't exist yet! Maybe you mean the G5?

I can warmly recommend the GH2, which surely will be topped by its successor, the GH3, and among the lenses the 7-14mm / f 4.0 super wide angle zoom, which is an awesome piece of glass you never want to give back!

But if the GH2/GH3 are too bulky for you: try one of the other members of the G-family: GX1, G3, G5, GF3, GF5 ... ...