So far, the 681 is my go-to for any time I'm not working. Its got a good length blade for its size and feels solid. For me, the clip is what makes it though. I don't like things in the bottom of my pockets, except keys. Usually knives of that size don't have clips so I would pass on them and get something bigger just to get the clip.
(Vectrex, I got the 681 because of your recommendations in this thread. Thank you.)