Since the Nikon RF is a knockoff of the Contax II, get a Contax II. It should also be noted that Nikon cut the base leg of the range finder triangle to almost half of the Contax II.
Going one more step, get a fine example (early) version of a Kiev FSU camera (perhaps recently serviced). You stand a chance of getting a Kiev assembled from actual Contax parts, that were obtained as "spoils of war" during the Rape, Pillage and Sacking of Berlin.
The Kiev also uses the longer base triangle and focuses faster, or more accurately than the Nikon RF.
That's been my experience. My Kiev shutter is also quieter than the Nikon S or S2. Ergonomically, it's a cheaper way to get the feel of the Nikon camera. My Jupiter 8 50mm f2 lens is also a fine example and shoots wonderful images.