Although I thought it would be easy, putting these in order of how much I enjoyed/quoted them, it was harder than I thought, as his first films were all full of great action and lines...
1. Hard to Kill
"I missed!? I never miss..."
2. Out for Justice
"Motherf#@ker, you knocked my teeth out!
3. Under Siege
"Jordan: You're not a cook.
Ryback: Yeah, well... I also cook."
4. Marked for Death
"Monkey: Hey, you want some blow?
Hatcher: Yeah, I want some blow. Put your hands where I can see 'em or I'm gonna blow your head off.
5. Under Siege 2
"Dane: Chance favors the prepared mind"
6. On Deadly Ground
"Stone: My guy in D.C. tells me that we are not dealing with a student here, we're dealing with the Professor. Any time the military has an operation that can't fail, they call this guy in to train the troops, OK? He's the kind of guy that would drink a gallon of gasoline so he could piss in your campfire! You could drop this guy off at the Arctic Circle wearing a pair of bikini underwear, without his toothbrush, and tomorrow afternoon he's going to show up at your pool side with a million dollar smile and fist full of pesos. This guy's a professional, you got me? If he reaches this rig, we're all gonna be nothing but a big goddamned hole right in the middle of Alaska. So let's go find him and kill him and get rid of the son of a bitch!"
7. Nico (Above the Law)
"Punk: I don't think you can take us all, badass.
[Nico shoots the punk dead]
Nico Toscani: No, but I'll get an A for effort."