I would very much like to see the 1944 Klimov-105 Yak-3 in AH. At only 5850 lbs loaded, its @1200 lbs lighter than a Yak-9U, and @800 lbs lighter than the Yak-9T, and its speed and climb are better than a Yak-9T, while having the 20mm nose and 2 x 12.7s rather than the 37mm. It had a great reputation for being nimble in a dogfight, with a great little bubble canopy. Nothing not to like. The Yak-9U would still be top dog for brute speed, but not handling.
As for the war, it got its reputation during the war, not after. Both the Luftwaffe and VVS pilots that flew it had a very healthy regard for its abilities. No, it would not be super uber, but I think it would be very competative, and a blast to take up.