For those of you wondering what the differences are between different lavs, Lavalier comparison is the link to a comparison of 16 popular models with prices ranging from $179 to $649.
The mics were:
Audio-Technica AT899
Countryman B6
DPA 4061
DPA 4071
DPA 4080
PSC Millimic
Sanken COS-11x
Sanken COS-22
Sennheiser MKE-2 Gold
Sonotrim
Sony ECM-44B
Sony ECM-55B
Sony ECM-88B
Tram TR50B
Voice Technologies VT-400
Voice Technologies VT-500

Voice tests were done on each one as follows:

Test #1. Male Voice, Interior, Mic Above Wardrobe, Interview Setup
Test #2. Female Voice, Interior, interview setup, above wardrobe
Test #3. Female Voice, Interior, interview setup, below wardrobe
Test #4. Cable Handling Noise Test
Test #5. Cutting Between Shotgun/Cardioid and Lavalier

Mike