First: Give up on chasing "crispy skin" in any electric smoker - ain't gonna happen. When I finally realized this, and just settled for the best smoked poultry I've ever had, a burden was lifted off my shoulders! Crisp in a hot oven or on the grill at the end, if you need to!
Now, with that being said, size needs should determine which one you buy. I have pretty solid experience with both the #1 and #2, and I hands-down prefer the #2. The Little Guy is a solid performer, but for not much more, the #2 offers a lot more smoker. More room, bigger element, 2 door latches.
If you need the room of a #3, John's suggestion isn't bad, either!