Gerber Fairbairn Applegate folder or Leatherman e300. the leatherman is strong, simple and extremely sharp.
The gerber takes an edge well, and seems to open with mind power only. it's extremely fast to deploy, and rides deep in my pocket. it's the only pocket clip knife i've never pulled out on accident.
used to have a CRKT Carson tactical folder that I liked ALOT but lost it and could not afford to replace it at the time. that's how I ended up with the Gerber folder.