Cheers for the advice on the motors. I think this is where I am going to struggle. I'd like to keep this aircraft as a single prop pusher, although I have to agree with you, twins are pretty cool, I own a multiplex twin star brushless that does sound pretty cool when at full chat.
I am thinking of using 4s packs. With this motor
Apparently with a 4s battery and 14 x 4 prop, it gives 492 watts @ 32A.
also looks like it will do the job -
As does this one
from BRc Hobbies
They all seem to be hoveriong around the 700-800kv range. - prop 14 x 7, 4s, 40A continuous.
A little low but it should still fly...hmmmm, I'm going to spend some time tomorrow looking the large list of hobbyking motors and reviews and see what I can realistically afford. The motor I initially had for this project is certainly going to be underpowered!