I use a couple of Sennheiser systems, I think they are EW 100 G3 systems (I'm not in the location where they are right now). One wireless headset, the other a wireless handheld. They have performed very well, batteries last a fairly long time, etc. The are on the "somewhat expensive" side but worth the price.

-Jim
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys