If you can't get your hands on a Basic 5, a Double Cut Dumpster Mutt is 9.7 ounces in a vest-quality sheath, and will do just as much except for the edge holding part. And cost you about $200 less. It's one of my favorites. S7 steel with as good a heat-treat as that steel can get, 1/4" thick... it's a lot to be happy about.
Oh, and for what it's worth, a Basic 5, if you can get your hands on one, will be about 9.3 ounces in a good sheath, and will give you 1/4" more cutting edge than the DMDC for about the same overall dimensions. The DMDC has a larger choil, as the difference. I'd give my full support to either of these.
The Dumpster Mutt Mod-7 comes with some nice spyderco-like serrations for about 1/3 of the blade, and a partial swedge grind toward the tip. It'll get you down in the 9.3 ounce range in a sheath, still 1/4" stock of burly S7. Take a serious look at this one.
Oh, and if you're interested, the Mod-7 resiprene handle is the basic line handle. The "Busse Combat" appears to be cut off with a razor blade.
I don't know why I didn't think of these earlier, I guess I was thinking INFI too much.