The 180, 185. 190, and the 195 were considered "pro". And as already said they fetch high prices. I like the 100 model, it has mainly metal body, some lens control, and can be mounted on a tripod. The Zeiss view finder can also be found on the 300's through 450's. They also are expensive, the 100 is very similar but does not have the zeiss viewfinder, which Ive never used but my 100's viewfinder works well for me.