So much depends on what your daily knife tasks will be and what style of clothing you where. You can can a heavier knife with jeans than you can with light knit slacks.
I would go with the SERE2K if your clothes can handle the weight. If not, I really lile the little BM 940 Osborne.
You could also get two knives ofr your budget and one could be a SERE2K and the other a small Buck or CRK&T for lighter duty and less weight bearing clothing.
Ane believe me, as those around here will tell you, I am certainly not pushing you to buy Benchmade, but the AFCK is a nice user, but not as rugged as the SERE IMO.
Best bet of all, try to find a used small Sebenza!