I would like to suggest the Spyderco Pacific Salt, the yellow-handled variant.
There are several reasons that I might suggest this; it is essentially the same design as the excellent Endura3, a staple of the industry for years. It is completely sweat proof---the design, made from titanium, H1, and FRN, requires little to no maintenance whatsoever on a daily basis. It is excellent for inconspicuous inside-the-waistband carry, and won't rust from your body's sweat. Also, the yellow handle will be easy to find should you set the knife down around work, or on a job site---this is particularly useful in a landscaping job, or one where visibility is important.
As with most Spydercos, the ergonomics are excellent. It is lightweight, thin to carry, and offers a lot of cutting potential. I can't say enough nice things about the performance and convenience of using the PacSalt.
:thumbup: