Leon. Have you ever had a look at the Cadex nailers? They're a pin nailer that shoots a "slightly headed pin". The key benefit to them is the increased holding power.
Now, I'm wondering how much of a difference there is between the foot print of a regular pinner and one of these "slightly headed pins"?
I've got to say, every time I'm in the market for something new, the internet can be a curse as well as a blessing. There's so many options for stuff these days that it's often a pain to pick something.