These Contax and Kievs are best left to collectors, here in Germany original Contax RF will be around 500. I own two Kiev copies but they hardly see the light, handling with the focus wheel is cumbersome - at least.
A Bessa might be your best bet, as a new Bessa will be cheaper than a old Leica M. For working a Bessa R/R2 should be fine. Just for trying out RF, cheaper options are available with fixed lenses.

Wolfram