As for our setup we use Shure wireless packs that require 9v batteries and boy that gets expensive. Two four-hour gigs on one 9v battery is the absolute best case scenario and when the battery drops below a certain level you lose your IEMs just like THAT. So definitely +1 to using packs that run on AA if you can find them.
As for buds I use FutureSonics Atrios that I got for under $200 (eBay, shipped), and they do everything I want.
As for buds I use FutureSonics Atrios that I got for under $200 (eBay, shipped), and they do everything I want.