What you need is like asking what you should wear today. It largely depends on the weather, right? If it's cold outside, you most likely need a coat. If it's raining, you need an umbrella.
When it comes to your photography gear, the same principles apply. What you need is based on your desired goals. If you want to do portraits, you're on the right track, but if you're trying to shoot weddings, the gear you have may not be completely correct.
In the end, you would need to clarify what your goals in photography are so we can answer your question in the right way. :-)
Sorry forgot to mention, I'm into portriat & glamour/fashion stuff mainly
So the Key Light (B1600) will likely to power the Extra Large Softbox or Octabox.
The coming B800 will be use as fill (Medium Softbox or umbrella)
So.... thinking of using the 2 550EX (as background & hair) or do I need to use a 3rd Bees for background or Hair ?
Any suggestion ?
In addition I sometime do wedding stuff & mainly travel with my 2 550ex + ST-E2 .... but may explore the possibilty using Alien Bees on road in the future.
??