I liked Paul Shenar's Alex Sosa. Some of his quotes were really good:

Sosa speaking to Tony Montana about his cocaine related business:

"I think you and me, we can work this thing out; we do business together a long time. Just remember...I'll only tell you one time, don't fuck me, Tony. Don't you ever try to fuck me."

Sosa to Tony, on the phone, after Tony killed his hitman in NYC:

"There's not gonna be a next time, you fucking, dumb cocksucker! You blew it!"

"I told you a long time ago, you fucking little monkey, not to FUCK ME!"