I would go with the lightest possible solution.
Something like this one http://www.hobbycity.com/hobbycity/s...trunner_1700kv
This motor is very similar to the CDROM conversions I use in my models this size.
The Spitfire has a longish nose and with the light motor the battery will need to be near the wing leading edge.
OTOH, WTFLYR used a GWS 350 geared power system in his and that weighs as much or maybe more than the motor you proposed. Some guys like a higher wing loading on their models and can fly them in much more wind than my 8oz light weights.
I ues the 5 gram servos in models this size without problems. Not sure what the torque output is but it's adequate for my stuff.