Christina Cline did some trims for my mustang and I really liked her overall, but I found it difficult to get her scheduled some of the time.
Roger Saur trimmed and shod my horses when I was in Whatcom County. My understanding is that he does quite a bit of reining/western performance. He worked fairly well with my horses -- I had two very green mustangs that he managed to work nicely with.
You can also look up and see if there are any nearby farriers listed through the American Farrier's Association: The American Farriers Association