A method I've been working on at a few friends weddings has been to accept a low shutter speed, (very low by your standards) and try to make it work with panning.
In this image below I'm at iso 800, F2.8, 1/30s, no flash. Focus was on the Groom's face. I'm aware theres quite a lot of blur in the Brides face, but I'm fairly certain that the bulk of it is actually due to depth of field rather than motion blur. If I had it to do over again I'd have bumped ISO even more yet, stop the aperture down for more DOF, and I'd try to focus on the bride (who cares about the groom right?).
The neat (I think) side effect of this is that the motion blur of the background caused by my panning imparts a nice sense of motion into the image.