Thanks folks,

So from the above, I have learnt that for power to weight, the best option is LiPos.
I need a Lipo Sack for every pack charged.
I will need 10s, does it matter if I get two 5s and put them in series? I'm struggling to find 10s?
Top brands seem to be Optipower and Turnigy
Good source of this stuff is Hobbyking or direct from Optipower (with the FRA discount).

Money is always an issue!

Terry let me do some research and i'll get back to you...

Suren