The Symphony by the Juice Crew is still the best posse cut. Every MC on that joint rips it and its the blueprint for any posse cut today.
After that, in no specific order
Crooklyn Dodgers I & II (I know none of the artists in either version arent officially a clique, but they are forever Crooklyn Dodgers)
Lafleur Leflah Eshkoshka - Boot Camp Click
Its a Doggy Dog World - Dogg Pound
HeadBanger - Hit Squad/Def Squad
I definitely agree on the symphony being the hottest posse cut of all time...there's many more that was nasty too...Crooklyn 1 was another one, can't 4 get about Buddy...