So, what do people think would help this shoot if I was going to invest say, $350 or $400 in something.  I was considering the 50mm 1.4 to replace my 1.8 at least.

My fastest lenses are the pana 1.7 and the FD 50mm 1.8.  Then the FD 24mm 2.8 and so on into the impossible to shoot in the dark world.

The 45/1.8 Oly is $300.00... a great deal, and AF, so, I'd bring a 20/9-18/45/45-200 for long shots, but a bumped ISO... Your flash can help lower the ISO with the 45-200 at certain points of the ceremony that allow flash.

Even the 14-42 is a great lens for sharpness up to about 15', (well the Orig Oly 14-42ED MkI), then the sharpness drops a little.. but still good detail.

This will allow AF with all your lenses at the Wedding.

Is the 45mm 1.8 out yet?

I think it'll be out in September. Amazon shows the item, but isn't selling it yet--you can only sign up to be notified when it's available.