Aww, what beautiful Shelties! I just love a well-put-together Sheltie and yours are certainly that.
One of these days I am going to get a high quality, performance and conformation bred Sheltie or Collie, but so far all of my Shelties have come from the local breed rescue. I try to at least pick ones with good bodies (not to mention good temperaments) since I do agility, but I do get some odd (ugly) heads that way. LOL