Have you ever been to a show up here in MN? I know the BCPPA and MN State Poultry Association both host some pretty big fall shows. Copies of the exhibitor lists are available with contact info on everyone. If you are seriously interested I have scanned off copies saved on my computer.
On the favorolles... Duane Urch (Owatonna) and Mark Peterson (Amboy) come to mind.
I'm don't hang out in the orpington section much, but Tony Ewert from MT Lake has Triple T Orps. Kraig Thoreson of Cedar Pines Poultry from Owatonna usually has some top birds at all the shows.
If you are looking for silkies, I am the MN State rep for both the ASBC and the NSBA. If you are truly interested in this breed, I have some contacts for you.
Just remember..... If you want to be competitive in the show ring, you generally have to stick to buying from breeders. You may have to get on a waiting list and prices will reflect quality. The fall shows are a great place to pick up tips and possibly some stock.