GK is indeed right about the numbers of coons being shown. I just checked the breed rankings for Maine Coons in CFA - over 100 in Championship, Kitten AND Premiership. A very tough breed to show in the US. No definitive figure for all 3 classes because the CFA breed rankings stop at 100.
The Maine Coon I'm showing for a friend is currently ranked #42 in the CFA world and she is a VERY good example of the breed especially for a female!
In all things Maine Coon, balance is very very important even though Balance carries very few points in the standard (only 5 points for Balance). It is, 95% of the time, the determining factor on which cat gets Best of Breed. Of course, I speak CFA only. It is interesting to note though that Maine Coon are 1 of only 4 breeds that actually HAVE points for balance!
I would suggest you go through the breed standards and determine (and be very critical) whether your cat, although perfect, is worthy of showing. Here's the link for CFA Maine Coons Standards if you will....http://www.cfa.org/breeds/standards/maine.html
Hope this helps some!