Leaning toward the Grex P635 or Cadex CPB23.35, but then I saw the new Hitachi NP35a. (Tried to post a link but they don't seem to be working.)
I have several Hitachi guns and have never had a problem with any of them, but this pinner is pretty new and haven't been able to find any reviews online. It's only $100 and most places online are selling it with a free hose, so it seems like a good deal. Haven't seen one locally.
All will take up to 1 3/8 in pins, and I can't see using anything larger. The Grex shoots down to a 3/8 in pin while the smallest the Hitachi shoots is a 5/8 in. Don't know if that would be a problem or not.