The Chimbley Sweep

I've got a Mercs / Storm at 42 currently, and recommend the combo highly. Storm has a lot of anti-melee powers, as well as general chaos-causing powers, both of which complement the Mercs' long range. Also, Storm has Freezing Rain, Tornado, and Lightning Storm to support the Mercs' overall low-ish damage. Thunder-Clap will work alongside the Spec Ops' stun powers to stun lieutenants and bosses, and you've got a single-target heal (albeit a lousy one!) on top of everything. I'd vote /Storm as one of the most synergistic secondaries for Mercs.

A small suggestion that may or may never have been heard before! And I can't really back this up with reasoning. But I would love it if instead of M30 grenade for our tier 3 attack, we had Sniper Rifle! It would compliment the general long range of the set, would up our power considerably - especially on alpha - and would replace a clumsy, weak-ish power with a very cool feeling, useful power!