Will the Acute 2 heads work with the Profoto 600W battery pack? I'm not under the impression that people buy Profoto to impress someone, I seriously got interested in them because rental houses seem to carry them because they are durable and what many pros prefer to use. They are not nearly the most expensive but considered really good lights, and many have stated that they really like the quality of the light that the heads put out. That said, a lot of those pros who use Profoto, don't use only Profoto modifiers.
Elinchrom has a reputation for taking a long time to get things repaired, that counts for something. I really like Elinchrom gear but wish I had your Acute 2 setup and considered swapping to just that last fall. My reasons came from a whole bunch of reading and questions but in the end I decided to keep what I have and spend my money on the modifers that I really, really wanted which was 2 Mola BD's, the Demi and Euro and the Elinchrom 74" Octabank and it's been a good decision, if I decide to switch later, it's just a matter of speedring adaptors. I would love to have one of the 600W Profoto powerpacks and heads, I've looked at them a lot at my store, and for me 600W would be enough.
But I am retired and don't work that much so there's no point that I can see for spending a whole lot more into this stuff, I got what I want to play with and for the last 3 weeks have been doing portrait sessions 5 days a week to mess with looks and further develop any style and idea I may want to try. With that, for me the most intersting thing will be the new powerpack that TMR has been telling us about that can be used with my multivoltage Elinchrom heads.
RE: Alien Bees, there are people here who thing they are the greatest thing going, but I've also read so much stuff about people having problems or waiting for their orders or really long times. It seems the thing that they are really good at is there servicing problems and that counts for something. But from what I've read here on POTN since 2007, I wouldn't touch them.