Mobile Studio Flash Quantuum R+ Dual Power with battery pack
I don't know how good are that specific model but i read interesting review about the follow line:
Studio Flash Quantuum Fomex HD
so i suppose should be good.
However the Elinchrom D-Lite 4 kit remain a good solution.
Naturally for outside use you should buy even a battery pack, the more cheap came from alienbees or innovatronix.