I have over 30
FWs in a line with 3 fishes, 1 hammerhead, Farsight, pirhana, 4 suits, 3 stealths, 1 drone team, 1 squad of pathfinders.
My army wasn't cheap, but it works great on everything that doesn't deepstrike (I hate those

'stealers and tervigons)
I can't say that I've ever really dealt with orks, as my friend who plays them likes to "bend the rules"