I need to do event photography particularly of awards evenings etc. An on camera Speedlite just does not give the correct light. The idea would like to use 2 x studio strobes each placed on lighting stands at either side of the stage. The options would be: Falcon Eyes 600w/s Satel Portable Battery-Operated Studio Strobe with HSS (cannot be used with mains power) or the Cononmark B4 Battery-Powered Portable Studio Flash (400w/s) (can tricky charge while in use). I would prefer strobes that can be used with battery and mains. These would be more versatile. Any comments, general or specific advice would be most appreciated!