The good folks at Brace Audio recently sent me a couple of the DWG 1000 wireless systems for my live gigs and they work great. Amazing clarity and virtually no signal degradation.
Check them out at: http://www.braceaudio.com/
Check out Rich Barbera. He built my electric 5 string and both acoustic 5 strings and he does great work!! He has a complete line of multi-transducer string instrument pickups that several other makers use.
Fred Carpenter at "The Violin Shop" in Nashville has done the work on my other acoustic. He designed the original "Carpenter Jack" for violins. I purchased mills mics for two of my acoustics from him and he also has great prices on anything fiddle related.