Meant to mention this to you guys before - but was reminded because Bobo, a THR member has just updated his chart. He has put a huge amount of effort into this and it is IMO a great ''at-a-glance'' way to compare different models for dimensions etc.
Below is a compressed and reduced image but to get a decent JPG image or if you wish a PDF version - go to Mouseguns.com links I am showing, where Marshall has kindly offered to host them. Any further updates will I am told be reflected if they occur.
http://www.mouseguns.com/PocketAutoComparison.jpg (approx 240k)
http://www.mouseguns.com/PocketAutoComparison.pdf (approx 500k)