One of your females is the Piebald pattern- you need to be very careful with your white especially in combination with the merle gene. This is why one of her pups (on your colors page) is so white and has white ears.
There are several breeders getting pups of that sort of coloration in show lines and are beginning to see deaf/blind pups. Just a heads-up; I wanted to tell you because I know you care and would be heartbroken. So far you are ok- it would be the next generation where you would probably see problems. My goal is that you never see problems.
I can send you a personal e-mail and tell you more if you are interested, but it will be tomorrow or so. I have to cook dinner now (Chubby says, Oh no, not again...)
I would definitely love to talk more about it. We've had Shelties for almost 25 years, but I've only been really researching the fine points of the breed for about 5 years (about the time we started looking into breeding) and I started with the basic stuff. White Factoring, etc... I've only been looking into for about 2 years and I think you get different input from different sources and I'm always interested in learning more. I joined a White Shelties message board about a year ago hoping to learn more about them, but most of the people there knew less than me and the poor lady who started the board was having trouble keeping up with everyone's questions. I'd be very interested in more information as we do have one of her daughters that we are breeding. You may be able to offer some insight into her as well as she is a Cryptic Sable Merle and one of the few I've seen/heard of. Usually with Sable merles they end up with few merling spots and just look diluted when people have trouble pin pointing the color. Lady has no dilution (I went back and studied her baby pictures for a VERY long time trying to find a diluted patch) and she is a very dark and very shaded. We got quite a surprise when her first merle puppy arrived. I noticed in the literature you directed me to that the Cryptic coloring can be passed along and that's something I would like to be aware of/know more about.
Anyway - my e-mail is firstname.lastname@example.org I'd actually been wanting to talk with you more anyway...