I only have the Shadow III in his one-piece range. The double guard has never really bothered me at all and the 4" is just about right for me. I like the spear point quite a bit for general utility use. If I was going to go for one of the longer one-piece knives I would probably buy the Shadow IV....probably with the one-guard. He has a Sable that I was actually pretty interested in a while back.

My Shadow III is just a fine knife, and I almost think that you cannot go wrong with any of those choices.