Sometimes on shoots, a little more power is needed. I have recently bought 2 of the new Godox AD200 flashes which could be a good addition to the lighting kit.
Having the power of 3 speed lights, a large battery capacity, inbuilt radio slaves and modular interchangeable heads they are pretty interesting.
I recently read on the Flash Havoc site that Godox have also announced an LED head for the unit. The LED power seems pretty low but if this is the direction of the modular system it could be very versatile.
The comments make an interesting read especially about the responsiveness to equipment feedback.