Ken, after a lot of research ( you are not wrong about the level of knowledge to be acquired for electric ! ), I selected the Turnigy 3542-1000 ( about 140 g / 5 oz. ), Zippy Compact 2800 4S battery, Turnigy Plush 60 A esc (could change) and Hubin FM-9 timer.
I am fairly confident that for a Banshee, there is nothing way out with this spec. I am only using the 60 A esc at the moment ( still in the set-up stage ) because I ran some trials on the weekend using a watt-meter and was seeing around 42 A ( and 616 W ) with an APC 11 x 4.5 EP at 12 150 rpm, at 70 % power setting.
I think with this set-up, I am going to need the heavier 2800 mAh battery ( 10 oz. ) as opposed to the 2200 ( 7.5 oz. ) to get enough run time. And as a general comment, yes, the plane so far seems quite light to me (the airframe).
And Tim, I understand totally why you asked if the short nose may have been due to too much motor or battery weight but you can see the motor is "about right" and if you look at the photo, this short nose situation is being caused by the battery position - it is kind of tucked neatly out of the way where it is, but of course there is no battery weight behind the L.E., causing the short nose. I placed the battery here, as at only 111 mm long, it fits the vertical space a little nicer than having it lie partially over the wing. ( Also I don't want to cut into the L.E. to fit the battery if I can help it.)
The set-up, as shown, is 4.5 inches from L.E. to prop. and the CG is on the balance point shown on the plans.
Does anything look way out with this arrangement ? It is only the second power system I have been involved with.