I'm a long-time subscriber to Acoustic Guitar magazine, and they do a good bit of coverage on classical guitars. While I'm a steel-string player, my observation from the coverage of the magazine is that, as Willie-O states above, Martin is not a big player in the classical guitar space, although I'm sure their classical guitars are very well made. Willie-N's is probably the most famous Martin Classical.

I recommend that you try to go through some issues of Acoustic Guitar magazine, and read up on the classical guitar market.

Hope this helps,
-Greg