There is a Mivatec MIVA 25 Photoplotter for sale on eBay. I think
this is the model that uses a 1" square high resolution CRT to image
the film. The CRT is indexed across the film to make the exposure. I
saw sample films from one of these systems in the mid 1980's and was
impressed with the quality.
If I didn't already have a photoplotter I would take a chance and buy
this one. It looks like the German company that makes them is still
in business so assistance and spare parts may still be available. If
I remember right these units were about $55,000 in the late 1980's.
Here is the link:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2532717956&category=26245
Tom