Mic recommendation for Panasonic PV-GS400

I need to find a decent external mic for $100 or less that will be used on a PV-GS400. I'm using it for my church, so it will mostly be used for filming gathers, services, and our praise team (singers). I've been looking at some of the Sony ECM mics like the 908C and am reading miced reviews about picking up motor noise from the camera and noises from bumping the zoom buttons and such. So can someone please lend me a hand here? Thanks.