I'm looking for an elegant and not-too-busy italic font to pair with Impressum bold headline. See options I've tried already. Most seem to be too light, or too busy. All ideas welcome! Thanks!
Here is what I would try first: find a soft sans-serif, such as Optima. It feels gentle without serifs:
If you still want a serif font, I would go with something that has more contrast than the ones you are experimenting with. The block/slab-ish feel of the "first congregational" needs a little contrast in the serif font below, to not feel off. You could of course use the original font, impressum, as well. Here, I am suggesting something like Didot; or find similar fonts of the Italian style with a good deal of contrast between strokes.
try asking on http://www.myfonts.com/WhatTheFont/ you usually get a response within an hour on their forums.