I know several breeders who are YTCA and list here:
http://www.breeders.net
Qualifier: I am not a breeder...
And I too would recommend you don't sell with breeding rights because not everyone is going to be as diligent as you have been and glad to see that you have done your background checking.
With AKC reg, offer a contract of no breeding, and a one year or more genetic guarantee and with the proper papers on line testing, and with beautiful yorkies, you should be able to get that price in many locations.
I think your decision is good regarding staying away from Craigslist.