Software :: Video / Audio Capture For Later Editing

I have recently been asked to help set up a "TV studio" for a church. It is basically a project designed to turn the church pulpit into a working TV studio where weekly sermons can be streamed onto the web, or even played on local public access TV channels, for those tech savvy partitioners that can't make it to regular sermons. The budget for equipment is very generous, and the church has expressed a preference for using mac computers for everything from initial sound and video capture, production editing, and streaming to the web and/or local TV stations.

Equipment they already have is the typical stuff you might find in a modern church, eg. 4 mics on and around the pulpit, a fairly new sound board (not sure how many channels, but at least 10 or more), some old mini-dv camcorders, etc. I'm starting from scratch here. This is an equipment and software question, but I'm posting on the software forum because they have already decided on a mac computer. It is just a question of whether an iMac or a Mac Pro tower will be used.