This is 11 months later, but just thought I'd mention I've used the Sennheiser EW-DP sets with great success. I've used analog IEM (PSM300 and ew300) before but when dropouts inevitably happen, the short burst of loud static coming out of the speaker can be quite disruptive. At least with the digital EW-D it'll drop out silently.
Senn also has an XLR plug-in transmitter that can plug straight in to an XLR cable that you can attach to a tall light stand or similar for best range. The beltpack transmitters work fine too, they just use a 3.5mm socket instead.
