I think your post is a victim of a poor title. I thought it was someone suggesting a new breed for the game.
As far as your question, I would look around and see which breed works for you as far as your desire for ratings, color, stud prices and availability...
KNN can be tough to breed exclusively true, because you can put up a stellar match and get a SH if a filly doesn't have Lp or a colt doesn't have both Lp and PATN (or even a PON if the foal is short for some reason).
If you like a challenge, KNN and RID are probably your ticket (small populations), but at least RID x RID always gives you RID and isn't dependent on color genes.
Clear with Temps dropping into the Teens
