thrila,
I don't think that the Spit XIV should be a perk plane in order to appease any percieved group of AH players. I think that the Spit XIV should be perked because of how perfectly and powerfully suited to the MA environment it is. If it were not perked it would run rampant, pushing many, many interesting aircraft out of viability. Unperked it would destroy the playability of the MA. I want it perked because I want to play a fun game/sim.
I think that the Spitfire F.MkXIVc should be perked at about 20 perk points. 957 MkXIVs were built and it entered service in January '44, and combat in March '44. Those numbers and dates are quite significant, it also isn't terribly fast at AH altitudes and with a "Spit14" icon over it, it will have a very rough time of it as many (P-51B, P-51D, Bf109G-10, Fw190D-9, Typhoon MkIb, La-7) free aircraft will outrun it.
Hopefully the Spitfire F.MkXIVc shows up in one of the next few versions of AH.