If you are looking to stop motion, as in freezing dancers, I would stick with Einsteins. You can lower the power and get extremely short flash durations. Combine them with either 64" or 86" silver PLMs to make the most of the light you have, and you should be able to freeze them quite well. The thread Leo posted (thanks for that, btw, very interesting read) makes it clear that the flash durations from Bees (or most other monolights) aren't always fast enough to freeze kids in motion, so I'm going to say they're almost surely not fast enough to freeze dancers in motion.
That said, you have to ask yourself how many lights you'll be using for the dancers, and what else you'll be using your lights for. You may find you only need one light to get the look you want, in which case one Einstein and two B800's might be sufficient. Given the color temperature differences, though, I would probably try to stick with at least two Einsteins, one for main and one for fill, and maybe you could get away with a B800 for your background since the color temp isn't as important there. But, if two out of three of your lights are Einsteins, if the extra cost wasn't an issue, I'd just get three Einsteins.
I say this even though I just arranged to trade one of my Einsteins for two B800's. In my case, I was using two Einsteins for the background and one for my main, but had no fill. I wanted that fourth light but didn't want to spend the extra $500 for another Einstein, so I opted to go for two B800's for the background and keep two Einsteins for main and fill. I haven't actually made the swap yet, but I'm hoping it was the right decision.