I don't usually post but I have a few:
Seismic/Tactical Arrow/Mace You get lots of recharge for seismic points,, tons of AoEs, and a lot of range. (Current favorite)
Fire/Atomic/Fire Hit them, let them close, use radioactive cloud and then inferno. Lots of damage and some control powers.
Beam rifle/Devices/Mace Best single target while debuffing them.
Ice/Ice/Mace lots of control and freezes
Water/Tactical Arrow and Time/Fire The extra recharge is good for getting tidal points.