Meant to say that i have the Dewalt first fix and 16ga dewalt, both of which i really rate, but didn't think as much of the 18ga dewalt which i why i went for the Milwaukee. I am fortunate to have batteries for makita, dewalt and Milwaukee. The Milwaukee 23ga pin nailer (imported from USA) is a great bit of kit too if that is something you may want in the future. I am pretty certain dewalt don't do one of them.
I have always found buying a deal for a drill driver is a cheap way to get batteries and then buy the bare nailer. I got a Milwaukee drill driver with two 4ah batteries for £145 on a deal. A 4ah battery will fire a decent number of nails.
Nick