I am in the market to purchase an air nailer. However, I keep getting confusing suggestions from the tool reps (at the professional retail level). I do plan on using it a little in my shop, but, my PRIMARY purpose has to do with a big re-model job. We are going to be replacing all the doors, windows, and most of the flooring in a 2400 sqft home. (this means window, door, floor trim(oak floors) & crown molding). For the door trim I am putting up a fluted 1/2x4 pieces.

FINALLY the question.
Which would you recommend A) 18ga brad nailer capable of 1-2" brads or, B) 16ga finish nailer capable of 1-2 1/4" finish nails?

Could you also recommend a good resource for the proper way to install interior doors, trim, crown molding, etc.

Any help would be greatly appreciated.

-john wilt