I was wondering whether anyone could help me in finding a serif typeface for this sans. There is an slab-serif that is part of the family, but i don't have a desire to use it.

I have found some possible options, but just wanted to sound out some other ideas.

Any assistance is greatly appreciated.

Hello, fellow typophiles! :)
I will save you the long introduction and frivolous background details. Suffice it to say that I setting a brochure in TypeTogether's lovely Adelle and am looking for a good sans-serif companion to use in headings. Do you have any helpful suggestions? I'd prefer a typeface with some kind of lighter weights (like thin, extra-light, display, etc.) but that's not a deal-breaker. Really, I just need something that will act as a good complement to the graceful slab-serifs of Adelle. So far, I have these in consideration:

• Gibson (Canada Type), http://new.myfonts.com/fonts/canadatype/gibson/

I'm looking for a traditional serif companion for Serifa. Your suggestions are appreciated!