How do these two models compare to one another as far as size. I have a pretty big round head and I'm trying to determine which would best fit me. I was able to try on the Brine and they fit pretty nicely but seems a bit small for my face. Is the Zane slightly larger?

Not sure on the sizes of those 2 but I had a similar issue with finding some large enough to fit my face.  I ended up getting the man-o-war's.  They fit very nicely and have removable side shields that are pretty handy.

I have seen that model recommended when looking for a larger size before, however I really don't like the style. I liked the Brine and the Zane looks similar but maybe a bit bigger.

Google is your friend.

http://www.costadelmar.com/store/Departments/Sunglasses/Expedition.aspx

Frame sizes are listed on the right.

I google everything. Already checked out the site and saw that. Just looking for anyone with some first hand experience that may be able to comment further.