I'm looking for a nice folding pocket knife that comes really sharp out of the box. Maybe something with both a straight edge as well as a serrated edge. If I get a nicer knife do I really need a serrated edge? Are there any that stay reasonably sharp without having to resharpen them? I was looking at the Kershaw Ken Onion Black Cyclone and it looked pretty nice...but I don't know a damn thing about knives and I thought I would look to you guys for some guidence.