At this point I would not even consider the 4.6K, It looks great on paper but BM is still working the bugs out and you might end up with a bad one with the Magenta issues they are having. There are other issues as well so at least in my opinion it is better to wait a bit and let them refine it some more.
I would recommend that unless there is a specific thing you absolutely need on a newer camera is to pick up a used older one like the F3 that IronFilm pointed out. There where great cameras years ago that are still great, you can pick them up at bargin prices and they are completed. Firmware updates have fixed all the issues and they have been around long enough to know if they are truely reliable or not. You don't need the latest and greatest.
I would say an F3 if you don't need 4K wtih external recorder and a Cooke 20-100mm T3.1(lenses are a better investment than cameras). This lens is a great lens, very vercitile, you can shoot an entire feature with it, and can be found for around $4000 but might take some patience. You can have a package that will deliever fantastic images for around $6000-$7000 leaving some budget left for other things. If you go the F3 route make sure it has the paid slog upgrade as it enabled 3G out the sdi giving you more recorder options.
This setup is large and heavy though so not a run and gun solution.