I'm Glad you started this thread as I too am thinking on the same lines, the engine I have is a fan motor, It has struggled with mtroniks 15 which I had but I was thinking of using a 25 like you...
I was looking over The Action website and was looking at the Condor 80s I know The ACtion products are good but like you wonder which would stand the test
a 80s which if anything did blow could probably be repaired or a Mtroniks 25 which although carry a 2 yr guarentee if it goes it goes..
On the wiring Diagram I have looked at for the Flying Phanton it shows a T12 Motor , how does that compare with a car fan motor..
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Whattype of mfa 6:1 motor is it, what voltage /amperage are you planning to use..