I'll chime in for starting with the small Sebenza. It's a great size, doesn't scare people, and in my experience anyway, sails through the airport using the old "pretend it's a money clip by putting some bills in the clip" trick. I have an Umfaan, and it is, indeed, small. I originally got the Umfaan as a Sunday-go-to-meeting knife, or for very dress occaisions, but find that because of the clip (I really like the "handiness" of a clip) I even wore the Sebenza when I got married, as well as a couple of other formal events. I've held several large Sebenzas, and found that they are, indeed, fairly large, that I might not carry it or use something smaller when amidst the "sheeple". Have at it, start small, and go from there!
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Don LeHue
The pen is mightier than the sword...outside of arm's reach. Modify radius accordingly for rifle.