Now you are speaking my language. To me the biggest challenge is which one to get first. I don't have a vast selection but I have one of each and I carry them all. I own a small 21 inlay, large Micarta Insingo, 25 and a Startac I don't think you would be disappointed with any of them (other than the small is small). For what its worth here is my feelings and in the spirit of enabling ... some photos;
- Insingo, the blade is a spectacular slicer and good for a wide variety of tasks I know you like Wharne's this is as close as you will get with a Sebenza. You can pretty much see what your getting with the ergos, it isn't a Manix but it also isn't uncomfortable in the hand and feels very secure. Not being an overly curvy handle it works well in a variety of grip positions. Not having a choil has its plusses and minuses but I like the extra blade length and you can position your finger over the edge of the handle (as if you had a choil) and it is very comfortable and very secure and accurate feeling.
- 25, if you want something more ergonomic and beefy to me the 25 is the one to go with, I carry the 25 the most of the bunch, I love the big pivot, Ceramic ball detent, thicker blade stock, phosphor bronze washers with the lube ports, CRK's version of FFG and ultra, ultra smooth. The detent is firm but once you get use to it you can flick it open with the thumb stud. Jimping is more robust than on the 21.
The Umnumzaan is a work of art the blade grind is beautiful same set-up as the 25 but with an over travel stop beautiful knife. I have the one with the new Pivot many people prefer the old style pivot without the over travel, I love mine but I was after the Wilson Combat version and finding one with an old pivot was that much harder again.
The first time you take apart one of these knives you will gain a real appreciation for the quality, there are so many little details that get you hooked. Here is an interesting thread on BF on just that;
http://www.bladeforums.com/forums/showt ... Sebenza-21
Hope that helps.