Well, I'm a noobe myself (4 months) but I would suggest giving the KI-84 a try. Decent guns (but you have to conserve), great turner (but needs flaps when speeds get real low), fairly fast for a plane that turns so well, tougher than other Japanese rides, dives well (but makes you watch your speed).
Just a nice plane that is deadly in the hands of the good pilots, harder to learn than Spits but easy enough to not be frustrating when you are learning. Works well for boom and zoom but can get you out of trouble if you get caught bleeding off your energy. A good ride to bnz the turn planes and turn fight the 51s, 190s, typhys, etc.
Regards