You might want to check out:
Cold Steel Twistmaster, which is a Carbon V Opinel-copy.
Or, you can buy a large Opinel, size 10 will do nicely. The lock will pop off very easily, and it will then become a regular folder. The steel is excellent, with amazing cutting power.
Personally, I'm not a big fan of the Opinel, design wise. I do like the steel, but I've found that the handle doesn't balance out the weight of the blade all that well, and the twist lock leaves something to be desired. When I first bought one (I've been through 3 of them) I took it to my neighbour, who is an old-school hunter/bushcrafty kind of guy, he took one look at it and said "Nice blade Adam, but I've used one of these before, and almost lost a finger when the lock slipped."
There's lots of threads on this board about modifying the Opinel, but personally I don't think it does a whole lot of good to the knife.
Please keep in mind that the Opinel has been around for well over a hundred years, and it is inside the New York Museum of Modern Art under the "100 Most Beautiful Objects in the World" display.
It is what it is.
A.