Focke-Wulf 190A9.
A bit faster, with less dead zones in it's power curve (5K-9K suck on the A8), no new 3d model required, less prone to oil engine with more armor on it, over 900 produced from autumn 1944.
Messerschmitt 109G6 AS.
Faster at high altitude no new 3d model required.
Other variant's of existing planes to speed up introduction of new planes in AH.