You might need to narrow it down a bit more than that. If you want a straight up wood-carving knife, then go get a Flexcut with the blade shape that most appeals to you, and the chip-carving knife is the one I use the most. It is hard to beat the comfort of the swelled handle, and the small, sharp blade gives you a lot of control. With a good handle and small blade, you really won't need to double up with a thumb on the spine at all. A 2-3" blade is useful for shaping and roughing in, and that would take an aggravatingly long time with the little blade though. For that sort of task, I use a couple of different blades depending on mood and location--and I guess none of them really meet your criteria. In public, I use a Boker War Toad (over the $50) budget, and on my porch I use a BK 14 (3 1/4", spine not rounded) with handle scales installed. If you are looking for a folder for carving, than a lot of the classic folders would do just fine, Grampa's Old Timer works well for me, too. I would probably use it more, but I don't want to risk wearing it out because it's the last Grampa knife I am ever gonna have. I would stay away from folders with a lock or fancy innards that are going to wear out quicker with the wear you are going to put on them, but that could just be my Luddite tendencies coming through. If you repost this question in the Traditionals forum, I bet you would get some good responses.