Need opinions - Used Gh2, Sony Nex 5r, Lumix G5 or Gx1?

Im looking to get a new camera, my first non-compact sensor. Currently use a lumix zs7.

Im interested in regular still shooting, and also video in low light settings (shooting my live band). Video quality is important, but Im not sure I need a huge array of video specific options (not shooting professional films). Sound recording is not a big issue when doing video, as I have several units covering that (Zoom h4 and q3hd) already.

A friend has a used gh2 for sale. Im considering this, or getting either a Lumix G5, Gx1 or Sony Nex 5r. I was also considering the lumix lx7, but the small sensor size scared me.

Price is roughly equivalent for these options.

How does a used gh2 compare to the newer G5? Or these versus the NEX 5r? I was also thinking the GX1 (cheaper) and then getting more lenses. But the GX1's video is slightly less i vs. p at 60fps.

Thanks!