I-16 -- The first single-wing fighter of USSR in WWII.
La-7 -- The one of the most famous fighter of USSR in WWII.
La-11 -- The last generation piston-engine fighter of USSR.
Although La-11 didn't so fast as La-9, but it was more modern, more automated equipment, gyro aiming, pressurized cabin. It will more easier operation and more comfortable than La-9. It's also the main piston-engine fighter of USSR and PLA at Korea.
From La-7 to La-11, although the flight model is very different because the laminar wing, but there are many same equipment of them, like Ash-82FN engine, it will reduce the works of the new plane.
So, maybe the La-11 will be a very good choice for next plan?