I happen to like this size knife. I own 3 that to fit your criteria, which I use. All mine are used for general outdoor duties, camping, hiking, ect.
My favorites are:
Fallkniven S1. It's a very strong knife, at a very reasonable price. Good cutting ability, with a great steel, VG10. Not too heavy, but will stand up to anything you throw at it. I trust it enough to have given it to my wife. It stays attached to her pack.
Chris Reeve One Piece. Mine happens to be his Mountaineer II. This is an extremely strong knife, with an incredible edge. It's one of my best cutter's. A little on the heavy side. However, it's doubtful you will ever break one. No matter what you do to it.
Bob Dozier Pro Guides Knife. This actually has a 4.75" blade of D2 steel. However, it feels like an extension of my hand. An unbelievable feel and balance to it. Great cutting ability. Due to its size, weight, balance, ect, it probably gets the most use.
The last two are a little pricy, but worth every dollar. If you want to keep extra change in your pocket, there are several less expensive knives that will last you a lifetime. Fallkniven is one of them. Also check out Swamp Rat, Becker, and Bark River. Just got a Bark River North Star. A little smaller than what your looking for (4" blade) but quite a nice knife. May be the best cutting knife I now own and it goes up against some stiff competition. There is a great review of this knife on Knifeforums, in the Bark River section.