The two choices have to be:-
(1) Late model Beaufighter, preferably with the anti-shipping cannon for clearing dawdling C150s out of the circuit.
(2) Mk IX Spittie with two-stage supercharger and the immediate-postwar "Laddie Lucas" wing-mod (This involves taking the guns out and replacing them with several bottles of champagne).
Seriously though, instead of a twin, why not get one of those super-mega fast singles with big long noses that you see parked around places (Rockwell Commander or something). What's the point of assymetric thrust?