Turrets

Aegis
Kuma: I consider Aegis a must have for most my games. The things it works against: Buckies, T99's, Seekers, SAMs, Chopper, Bomber, Striker, Bombs, and most importantly L4 Creeps. If you don't want you units to die horribly to L4 Creeps, you better bring these. Even the most hardy defenses will crumble before waves upon waves of L4 creeps. Unless you spam a ton of heal units or some Aegis turrets.