I want to report that with a Canon FD 135mm f/2.5 lens I didn't need to go above ISO 200 in an unlit church with my GH1. Lens was perfect. This lens can be found for around $80-$150 dollars, and it's worth every penny, at least for wedding work.

Which vendor are you using for your adaptors? The ebay guy I got mine from is sold out.

I purchased the last Kipon adapter I could find domestically, and I can find no other adapter anywhere in the U.S. except for the Novoflex.