Bang for the buck = Guarder
Perfect fit out of the box = Creation
Nicest finish, feel and details = Prime
Never handled G&P, so I can't classify it.
If you can afford it, and have the time and patience to get it fitted, get the Prime. It's the nicest frame (it's not nice on your wallet though).
http://www.pbase.com/illusive_airsoft/p226navy