As Terran
Make:
Viking
RavenMissile TurretDetection plus a Viking makes cloak harassment expensive.
Open in the counter tool with Banshee tagged ->As Protoss
Make:
Observer
Stalker
PhoenixObservers at home and with the army keep Banshees from splitting you.
Open in the counter tool with Banshee tagged ->As Zerg
Make:
QueenSpore Crawler
OverseerSpores and Queens stabilize; Overseers keep the follow-up honest.
Open in the counter tool with Banshee tagged ->
Marine
Marauder
Reaper
Hellion
Hellbat
Widow Mine
Cyclone
Siege Tank
Thor