The Sony ECM-88 is wonderful and works well under almost all conditions. The Sony ECM-55b is the traditional "studio standard," and works especially well when placed under a layer of clothing. In fact, when used properly, that 55b can truly impress.
I use Tram TR 50s and Countryman B6s. Super reliable, excellent sound and not obtrusive. Like always depends on your budget but check the audio forum for sure. So while I was writing this I realized I should also mention the Sanken COS 11.