I've been watching a U.S. based coil builder that shows promise. This outfit, Razorback coils, just went through a change of ownership (he handed it over to one of his buddies), and he's developing new product lines. As with most small flexible high tech outfits, he's open to developing custom designs. Worth checking out...
http://razorbackcoils.webs.com/
http://razorbackcoils.webs.com/