Rated by most as one of the best out there; The Cadex 23g pinner. Have a quick look at what Neil Mckinlay thinks about it below.
Here is my in depth field report of the Cadex 23g Pin nailer. It's not that in depth but I tell you what I like and dislike about it. If you're in the market for a pin nailer, I'd recommend this one, I've used a few different ones and this is my favourite gun to date.