There are limited parts available for repairs, recently I asked the NJ service center if they could repair a faulty lens bus contact on a 203fe, and they said they could not as the parts were not available.
I think it is unreasonable to buy an electronic camera that has been out of production for 12 years and expect to be able to get it repaired. The price reflects the fact that it is out of production, cannot be repaired, and the desire of people to still shoot with it. The fact that the 500 series can still be repaired (because so many were made and so many parts till exist...) is a big bonus.
All that said, I have owned 500c, 500c/m, and currently shoot with 503cx, 2000fc/m 2000fc/w 203fe, and the one I use the most by far (as still do) is the 203fe (even with the non-functioning lens bus). It does everything - C, CF, CB, F, FE lenses, as well as adapted lenses (ie: Imagon), leaf or focal plan shutter, meters (still), has a bright screen, and is the really nice camera to use. The 2000fc/m is close behind (missing the meter, noisy shutter, but batteries last for ever).
I've kept the 503cx as a mechanical backup, but I've really never needed it. I just can't let it go - the 500's have such a nice sound and feel when you release them...
Other things to consider:
- The 2000 series cost more to repair than replace (used). Hence no one repairs them.
- The 200 series can be repaired (limited) but the cost approaches a replacement - it has to be sent to Sweden. Is repairability really a good criteria?
- There were 2 critical weak points in the 200 series that resulted in display model - the shutter release magnets when they failed were not replaceable (parts ran out years ago). I can't remember the other - but these were the early and most common issues with the camera, and they did not happen very often.