some links:
http://www.chm.bris.ac.uk/pt/diamond/othergps.htm Links to other groups studying CVD diamond
http://www.micrelinc.com/lines.html Micrel Associates, Inc. representants from some diamomd makers
http://www.p1diamond.com/terms.html P1 Diamond Inc.: Products and Services: Terms and Conditions - Affordable Industrial Diamond
(my best bet to try buying from)
http://www.rhobest.com/eng/indexa.htm Rhobest
http://www.sp3inc.com./ sp3: advanced diamond tooling -also heatspreaders-
http://www.diamonex.com/ Welcome to Diamonex,
my current idea: to use 0.5 mm thick CVD diamond plate and make a version of Cathar's block with more channels (as fins will be half the thickness) with all heat transfer active parts made from diamond; using metallized surfaces in the inner side of base plate and edges to tin solder diamonds