I know some people are really quite against crossing strains, and I understand that, I do. And I think in many instances, that's a good tack to take.
However, I will quote what Shelby Harrington said to me as I sat in his house here in KY (he moved here about two years before he died, a terrible loss to the fancy.) When I told him I was looking to get into a new breed of bird I didn't have any of at the time, he said to me "Be sure to get birds from at least three different breeders. Then cross them together, hatch as many as you can, and cull hard until you get what you want."
Of course, he meant that I should work with the Standard too, that was a given. But I took his advice very much to heart, and it has worked well for me. I miss him a lot, when he had his heart attack and died, a ton of knowledge went with him...