The ultimate short-reach calipers are made by Dia Compe. They have a couple models of ultra-short reach, but if I recall correctly, it's the Gran Compe's (which came in a couple different configurations) that were all very short-reach:

http://www.yellowjersey.org/agc.html

Check www.yellowjersey.org since they usually have that kind of thing. You can also find them on eBay pretty frequently.