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Well, for a start you don't need aperture more than 30cm for two reasons:
A) the moon is very bright, and
B) the atmospheric seeing is very rarely better than 0.2 arc sec from any location you're likely to use as an amateur.
As for the scope:
If you were to use it for nothing else a 30cm f/23 Tri schiefspiegler would do very nicely. The late Barry Adcock (ASV) made one many years ago for photographing Mars and his images were phenomenal.
My next choice is a Santel (Russian) f/15 Mak. Santel doesn't exist anymore and these beasties were rare as hens teeth, though the optics were superlative.
Failing that I'd look for a 25-30 cm f/15 Mak from a reputable maker (TEC or AP come to mind) though you'll need deep pockets and an observatory to mount it someplace with really, really good seeing. Speaking of which there was a 10" TEC for sale on Astromart recently.
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