Plettenberg is another option:
http://icare-rc.com/plettenberg.htm
Rob and Kyle know what they're talking about. Outrunners are less efficient, but if you have the battery capacity and can properly cool everything, you can use them. The advantage is no gearbox (one less thing to break or maintain). YOu would also need to insure your mount, or nosering, could handle all the loads since you can't support the back of the can (it rotates). Icare-rc will help you investigate the Plettenberg option.
The real question is: What do you want to concentrate on, flying or tinkering? With a Hacker the experimentation has been done for you by TonyF and Jason Schulman. No need to tinker. If you want to be different and tinker a little, then, by all means go ahead.

Disclaimer: I don't own any big electrics, I have just read what others have done.

Terry