I would say a 16, or an 11, or a 14 which is an 11 with an Izula (ESEE brand) handle (that means the 14 does not have the bottle/can tab opener), but a BK 2 is overkill, unless you want to field dress your car, and a BK 9 is just to big for what you're gonna do within a mile of your car....
The 11 you get a neck knife (hence the name) with a skeletal handle and on said handle is a bottle/can tab opener, so a paracord wrap is ideal, but I don't like the (kydex self retention) sheath by itself, unless you wear it as a neck knife, it's probably on your belt or piggybacking off of a larger BK, if it's on your belt, then you have a couple easy options, option 1: no more expenses beyond the knife itself, paracord belt and/or backpack strap loops of your choice, option 2: a $10 TDI clip from Ka-Bar, vertical carry option only, which if your like me, then you don't like handles in your side, option 3: TDI clip on your packstraps or MOLLE/PALS webbing, for horizontal or vertical carry respectively. You can also add additional retention with paracord and a fishermans knot in the bottle/can tab opener, or with some bungee cord (like 1/8 in. diameter).
The 16 you get a nice knife for everything, with new black zytel handles (ooo!) and on top of that, a second set of tan zytel handles (aaa!), a tan cordura sheath (I think it's actual 1000 Denier cordura, not cheap nylon) with not one, but TWO snap retention straps! You can also attach it to the MOLLE or PALS webbing systems on your pack for quick access when it's not on your belt, or add a leg strap to secure it to your thigh while running. The sheath also has a front pouch (I don't know how big it is, but it's not to small for a spydie to ride in), and the cordura is dyeable, so if you don't like the tan, you can go with a darker color. The only downside I see to the 16 right now, is that it may be a safe queen (unused, ever...) for you because it's only the first production run right now and it has been laser etched with "First Production Run" and Mr. Becker's signature, so I don't know if you can bare to do that to a piece of Ka-Bar history, I can, but that's just me (I work at Boy Scout summer camp, I can do a lot of things most people can't do, emotionally).
All three are capable of a tanyard (lanyard attached at the end of the tang, designed for either your entire wrist, or just your pinky if you want a 3 fingered grip for chopping [not recommended for the 11/14]), and all 3 are GREAT bush crafting/camp chore knives, and I am really looking forward to see what you choose, and I hope you stick around, it's a lot of fun here.
Off topic:
BK2 is a great knife... first knife to give me stitches (i am kinda young)
Same here Mej, except I got glue because my Scoutmaster didn't think it was worthy of the ER at 7:30 at night, great knife to lose your stitch virginity to, isn't it? I cut my thumb to the bone first time using it outside, didn't even feel it till I wrapped it!