Yamaha S-80 or Roland XV-88. XV is more of a synthe with many tweakable parameters. Roland RD-700 might be a good possibility as well. It has a small sequencer, plus organ drawbar simulations. I haven't played one though, but I have played XV88 and liked it. RD-700 seems to be a bit easier to learn and might be more suited for a church.
Haven't played the Yamaha either, but I've got a friend who seems to enjoy it quite a lot, and I've read many favorable reviews.

[This message has been edited by FAEbGBD (edited 01-06-2002).]