I'll go against the Grain here: I can't stand the BK-7. lol
But I do Love the BK-11, BK-16, and BK-12! Can't pick just one cause they are all so different.
BK-11 cause it's the perfect size to have on you at all times and can do more than most knifes it's size. Very comfortable in my hands especially with scales.
BK-16 cause it's the most useful size knife for most tasks and is more comfortable than any other knife it compares to.
BK-12 cause it's my favorite large Becker and is just plain sexy. Beat's the 7 hands down. haha. I know you BK-7 lovers hate me.