So glad you found us, Dave! If you've browsed around here much, you've probably noticed I'm more than a little excited about Smokin-It smokers!
I was in the same boat as you, and your story sounds just like mine, close to 2 years ago! You won't have buyer's remorse, and won't have any regrets. Go with the biggest one that fits your budget - easy to do less in a big one, but not so easy to do more in a small one! I have a #1 and a #2, and absolutely love the #2.