Cheap Used Body for Video

Ok, so after doing some research, these are the options that seem to pop up. I'm assuming I'll be getting either an external microphone or a dedicated audio recorder for any of these options, and budgeting $100 for that.

- GF2 with video hack + LVF1, ~$200. Pros: The cheapest option and it has a tilting viewfinder. Cons are that it's fairly old if I want to use it for stills, no peaking, can only use dedicated sound recorder

- G6, ~$300 (on ebay). Pros: sounds like video is comparable to GH2 with hack, has a mic jack, peaking. Cons are no EVF tilt.

- GH2 with hack, $350 (on KEH). Pros: Probably the best video camera on the list. Cons: No peaking, no EVF tilt.

- GX7, $350 (on KEH). Pros: Newest sensor good for stills, tilting EVF, peaking. Cons: No mic jack.

Based on these, I feel like I should consider the bottom 3 options (G6, GH2, GX7) as they all provide EVF and have room for a hotshoe-mounted audio recorder (if needed). Out of these three, the G6 and the GX7 require no hacking/fiddling - am I correct in saying that the GH2 can only do 1080i/60 natively, and I would have to deinterlace? If that's the case:

Between the G6 and the GX7, which one should I be on the lookout for, or are they fairly comparable for my intended uses?

- Does one have support for a better codec or higher bitrate than the other?

- If I want to learn how to shoot in a 'flat' profile and grade the footage, does one have better support than the other?

- Does one have a higher crop factor than the other?

- I know for stills the GX7 has a stronger sensor, but does that matter as much in video?

Thanks!