Yak-9T.
Most folks think it's a Ground Attack plane, but it's not. It does seem underpowered, and so it flies a lot like the Ki-61 IMHO. That is, when you have energy she's awesome, get slow and low and your ****ed.
What most people underestimate is the Cannon. If you use simply 3 round bursts you can easily enforce ammo discipline, and the excellent ballistics allow you to reach out farther than people expect (like the La-7 that is "extending" after trying to bounce you).
Anyhow, it only has 32 rounds, but then again, it only takes 1 for a kill.
-Sik