The Leek would be a good choice, but there are two that I think you should also look at
-Kershaw Lahar- VG-10 blade, stupid easy to sharpen, flipper for assisted opening, and the size is almost dead on what you were asking for: Blade Length: 3 1/2 in. Closed Length: 4 7/8 in. price $62.50
-Kershaw Blur in SG2- A little out of your price range (NGK has it at $87.50), but SpeedSafe opening, SG2 steel, again very easy to sharpen, a little smaller profile than the Lahar, blade length 3 3/8 in., closed length 4 1/2 in.
I own and use both, they are easy to EDC, easy to make very sharp with a Sharpmaker (even sharper now that I have a strop), one is well within your budget, one is very close. I suggest you try and handle all knives suggested in person before you make a choice seeing as you are looking for only one more knife. Be forewarned: 10 months ago I was looking for just one more knife. That was
30 knives ago. Oops
Hope this helps
Rik