I've read through a few times and unless I keep missing it, you don't say what your "task" is. You've offered some parameters, but the first response to any "which knife should I buy" thread around here is usually "for what?".
You want thin, but strong, with a five inch blade and narrow in the belly. A little fancy I believe. Add the use and we may get a "Bingo!" There are some great suggestions so far. I actually thought the Ontario Blackbird was going to fit the bill, except the fancy part.
I already have a few knives that do what I need since I ma a bit of a knife nut. I've also given away maybe 150 knives I bought and tested over the years. I just want to know what good choices are out there to test next.
You are correct that there have been a couple of good suggestions, but clearly many people didn't read or comprehend the request when listing thing like the BK2.

The task for this knife would be many, all the bushcraft functions you can think of, which any knife will serve. When it comes to processing game things get a little more tricky. I've use anything from some traditional folders with 3" blades to large 7" blade knives. Please keep in mind when I say processing game I mean all sizes and from filed to freezer with the same blade.
The task smaller blades can somewhat handle provided you can get a good grip on the very end of the handle is cutting around the inside of the pelvic bone to pull out the colon. over the last 30 year I've developed a method that provides cleaner processing with little hassle. The big wide blade simple fail this task or will not do the job cleanly.
Yes I know there are many other methods, I just prefer this one.