I can't speak from experience on Jane's series, but good choices for combat flight sims now are:
Falcon BMS (essentially an expanded Falcon 4.0, expanded a bit into aircraft outside the F-16 family)
DCS (Full autism aircraft modules as well as some simpler ones that don't require 600+ page manuals. Currently has a version of the P-51 and Su-25 for free as a "demo".)
IL-2 series for all your WWII needs.