What is the best PC flight simulator game that money can buy?

Just wondering...I have a pretty awesome gaming PC and I'm ready to try it out, plus I love flight simulators. I know Microsoft apparently put out Flight Simulator X or something like that. There's also an X-Plane.



Are these the only "top two" or is there something more realistic than these for the PC?What is the best PC flight simulator game that money can buy?
Ace combat
(I don't know exactly what its called but if you go to gamestop and look at ace combat on pc they're pretty fun and realistic)
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