If I were you doing what you're doing, I'd go for a 4K camera. I mean, if you're really serious about what you're after. If it's legit scientific research you're trying to accomplish, then 4K is a worthwhile investment. It's also going to give you options in post that you're not going to have otherwise. Smoothing the tracking bumps from inside a moving car, for instance. Digitally zooming into specific areas, etc. Also, a cam that shoots 4k @120fps would be pretty incredible for extreme weather shots and post analysis.
Ultimately though, I'd take 4K resolution over RAW from something like a 5D @1080.
If you're just chasing some thrills and want to get there on a budget why not a hacked gh2 with the fastest flash cards you can get? If you want to get footage to a "network" then sending them the captured file (compressed) is the quickest way to do so over the intertubes.