I would avoid "breeders" at all costs personality and look for workers, plenty of which are kc reg. There are a few breeders who will breed "to keep a line going" but will often user untested dogs and ate obviously in it for the money or to make a name for themselves through breeding rather than getting their dogs out in the field and doing the biz.
Don't listen to the scaremongering either mate the lads i know who own lurchers have had more injury worries than the folk worth whippets and i know a lot more people with whippets.
Hope you find what you ate looking for