Only thing I can tell you is.....you're likely going to wish you had bought a DB if you don't. I can't imagine NOT being able to shoot when an animal gave me a shot opportunity. In most blinds.....you'll be at the mercy of whether or not the animal happened to stop in one of your shooting lanes (i.e. a window in the blind). With the DB......you ALWAYS have a shooting lane. That, alone, is enough to reassure me that I made the right decision.

Do what you can afford to do......but I wouldn't skimp if I didn't need to.