I would also rent the camera. and it's actually, I think, much easier to even drive the 15 hours to pick it up from the rental house than to try to buy a good kit for cheap which is both good quality AND quiet AND reliable. and the lenses cost quite much in all cases.
something like rented Arri SR (1, 2, 3) and set of Optars or mk1 zeiss lenses would work I think.
if you want to try the eBay cameras you need to either hire a camera tech or try to fix it by yourself. There's always something wrong with them, usually by improper (seller made) service or missing parts. I myself like to fix and tune and modify old cine cameras, especially Soviet ones, so it is not a problem for me but if you just want to shoot a short film it is not practical, not at all...
It's like wanting to just drive a good car but having only little cash, then purchasing a heavily used one from a stranger without knowing its history and what kind of service it has had.... then spending most of the time fixing it (instead of actually driving it...)