I've never purchased from BuyDig, but he has good positive feedback, and as far as I can see, he sold forty five 70-200 2.8ii lenses for the past 24 hrs. In addition, he offers 30 days for returns. I think you should be fine, especially since CR guy recommended him. Enjoy your lens!
So I pulled the trigger with BuyDig. Maybe should have waited for a bit and the B&H would have come along. Any Buy Dig satisfied customers out there?