SR-22 with NXi is awesome now since Asobo tweaked the performance numbers - it acts like the FAA high-performance airplane it’s supposed to be - 180 kts, 310 HP.
Bonanaza B36 with Robert Young’s Turbo Mod and NXi - an absolute cruiser at 205-210 kts; make sure you raise the cowl flaps to get that last 5 knots.
C172 G1000 with Tommymxr’s JT-A mod - a 172 that actually moves because it’s a turbo-diesel engine - no messing about with mixture; easily 120+ kts plus 17-18,000 max ceiling. The NXi works well for navigation and most MFD functions. It needs a modded system page for the engine info, but everything is functional.