The major difference between the HMC70(http://www.bhphotovideo.com/c/product/547680-REG/Panasonic_AGHMC70PJU_AG_HMC70U_Shoulder_Mounted_Camcorder.html) and the HMC150 is the 70 is a shoulder mount camera. It's has fewer manual controls than the 150. The HMC150 is not a shoulder mount, but for church services, you're going to be on sticks anyway. It does well in low light, and offers a range of shutter speeds. Videomaker did a complete review of the HMC70 here: http://www.videomaker.com/article/13695-panasonic-ag-hmc70-avchd-pro-camcorder-review
For audio, consider recording on a digital recorder such as the Zoom H4n (about $270). Top notch sound quality and if you don't mind synching up during editing, it's a better quality than most cameras can supply. It has XLR inputs and also records on SD cards in WAV format.
