Years ago, I spent the extra money on a laminated sectional...and it worked great, both for my work as a student, then as an instructing tool. If you get one, then get an Ultra-Fine Sharpie permanent marker and a cheap-o bottle of Expo, and you've got yourself a sectional that will last way longer than it's currency expiration. Here's where I bought it; this guy sells them all, not just the Phoenix one that he has advertised:

http://www.flyaas.com/acatalog/Onlin...HARTS_162.html