At least one DAvenger box is absolutely required, ideally two. Get a Guardians box if you want a heavy weapon platform. Storm Guardians are a meme. From there it depends entirely on what you like to do or plan to fight. Scorpions are decent from what little I've seen of them, Banshees are only reliable for going after other t3 targets and tying enemies up. A ranger or two wouldn't hurt, but they're not auto-include either. Wraithdudes are powerful in close quarters, but suffer from the same problems as other Terminator equivalents.