RE: some opinion for the gp tutor?
I didn't have a tutor, but I flew the BLT, which shared the same wing and tail group. The Tutor is, I believe, A BLT with a fuselage.
That said, I think that the 400 would be too heavy for the Tutor, especially if you're thinking of running it with 2000mah nimh batteries. My BLT flew with the GWS 300 motor and 8.4V 650mah nimh's and I can't imagine flying with much more weight. You might get away with the 400 motor if you get some small, 3S high discharge Lipos.