Just ran across this thread... I've been playing for both our services at our church for several years - we do a "blended" service first with choir and orchestra and then a "contemporary" service with band and vocal team. (I actually learned to play bass in the same church by playing with youth "musicals" a LONG time ago!). We went to Avioms a while back and they are great - the only issue I have is that the sound guy uses different mix presets for each service and I have to readjust all my levels for the contemporary service. A minor quibble as long as I have time to get good levels set... a major quibble when we play with a click track and I suddenly can't hear it.
No amp for me - I go direct to PA through a Sansamp Bass DI and then into a Raven Labs MDB DI. About a year ago I went from Sony MDR cans to Westone UM2 dual-driver in-ears with custom ear molds...absolutely love them, all the low end I could want.
Our PA has EAW speaks and subs, so sound quality is potentially pretty good. Then we go and ruin everything with a set of Roland electro-drums.

The new young worship leader is adding his voice to my long-time rant about needing real drums with a shield to improve the sound.