As the elite choice I'm taking these guys to put some hurt on any ap2 stuff.
The fist is there a) because it looks cool and b) so they're still a threat after they've shot their load. They can hunt a tank or monstrous creature maybe.
They'll be joined by their Battle Leader with a power weapon too. Not sure of what type yet...
The idea is to give my opponent too many targets to choose from so at least something will survive to combat