"House of Portfolios" books are sort of the industry standard for photogs and all other people in the biz who need books in NYC. They're extremely well made, very reasonable for the quality, and work well - a nice, no gimmick solution that can be messangered around day in and day out for years and still look good. They're totally custom and will make anything to order to fit your needs, including cases boxes etc etc etc. Just ask them.
The heavier up front price, for me, was totally worth it, especially for books that really gets used.
Edit, oh, I just read you already have a leather 11x14" book w/ case...so maybe I'm suggesting something you already have. Still I bet House of Portfolios could make a really slim 8x10 if you talked to them.