when i think tactical, i think 4" or more, but if it's your only folder i'd size it down for EDC and control.
1) Spyderco Military. I would have said Endura but it's made in Japan.
2) Kershaw Leek. the assist and frame lock make it more 'tactical' than the UKPK. i think these are the two best EDC's in production, and not just in the US. i know, sebenza...