One knife that matches your requirements is the Kershaw JYD II (junkyard dog), titanium scales,with G2 blade steel. It is Kershaw model #1725SG2. It is a relatively expensive knife $180+, but you can buy blems of this knife online from someone who calls himself "kershaw guy", for $79. I bought one and I have been over it a hundred times and I can't see why it's a second. It is by far the sharpest, from the factory folder, that I have. SG2 steel is one of the so-called super steels. It has great edge holding while is still easy to sharpen. You can google both the model and the steel and see what you think. Here is a link to youtube of this knife in hand, to give a sense of it's size and style of opening. http://www.youtube.com/watch?v=W7KyMlm_8nU
There are a lot of knives that will meet your requirements, but this one is the first that came to mind.
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