If you already have strobes I would suggest portable battery/inverter pack instead of a new set of DC strobes, that way you don't have to buy all the modifiers again.
Here are 2 battery systems to check out, and there may well be more than these out there.
The Dyna-Lite XP1100 Ws power supply http://www.dynalite.com/fxp1100_n.html
If I didn't already have an Elinchrom Ranger when these came out I'd have bought one of them instead. Plug any light into it and it's just like plugging it into the wall. The downside is that it costs around $1000.00
Next is the Tronix Explorer 1200 Ws power supply http://www.innovatronix.com/cgi-bin/...alog/index.asp
I hear lots of great things about it and at $249.00 I'm thinking of getting one for backup power wherever I need it. Here's a review of it on Rob Galbraiths site http://www.robgalbraith.com/bins/con...id=7-7883-7908