I used to carry Spyderco knives all the time and still do on occaision. A few years ago I picked up a Kershaw with a Ken Onion designed spring assist, the onion. The knife was small, light, sharp and incredibly fast to deploy. The past year or so I came accross a much larger Kershaw RAM, that acts like it has a spring assist and love it. It gets used frequently and holds an edge well. Considering the amount of sweat and salt water this has been exposed to it has been incredibly tolerant. If this one ever gets lost I'll buy another. Although I carry the plain blade, the serrated version can be seen here Kershaw RAM Flipper Hawk-LockŪ 3-1/8" Satin Combo Edge Blade - Knifecenter.com
I've had good luck with a variety of items that have been purchased thru the Knifecenter as far as quick, reasonably priced shipping.