The cameras I've used include all Leicaflex variations, Leica R3, R4, R-E, R6, R8, Nikon F, F2, Nikkormat FTN, Olympus OM-1 & OM-2, Pentax Spotmatic and ME, Minolta SRT-series and Canon FTb. Of these, the ones I like best are the Leicaflex SL if you don't need diopter correction, or Leicaflex SL2 with the Leicaflex SL viewscreen if you do need diopter correction.

Following these in approximate order of preference are Leica R8, R6 and R-E, Nikon F & F2 & Olympus OM, then Leica R4 and R3 and Nikkormat FTN, Pentax ME, Canon FTb, and Minolta SRT-series, and Pentax Spotmatic. For those who are over 40 years old, diopter correction is very important and will make most of these cameras a pleasure to use.