Check out this article for a variety of solids that will go with the Cuzco line. I'm thinking of getting this myself, but haven't pressed the button yet! This blog has a regular feature recommending solids that go with a new line they are carrying, as does Hawthorne Threads. Very helpful feature.
[url=http://www.pinkchalkstudio.com/blog/2012/11/14/what-goes-with-what-cuzco-by-kate-spain/]What goes with what? Cuzco by Kate Spain | Pink Chalk Studio
United Notions advert page has Bella Solids recommendations too:
http://www.unitednotions.com/fcc_cuzco.pdf
Pink Chalk recommends Free Spirit Artic White. I would be very cautious about using Kona Snow with this line. It has a yellow tone to it. I would think the Bella Bleached White would be a better choice for this cool colored line. JMO.
Hope this helps!