for that budget you may actually be in danger of overspending if it is just for MSFS.
My preference, and I have very good experience with that, is to find a specialist PC builder and give them your requirements.
Ensure that they put in as much RAM as it will take, a top graphics card and a processor known to work
well with the chosen graphics card and Ram modules.
They will probably want to fit a solid C:\ drive so always add an extra hard drive of a couple of TBytes.
The main thing is that it is build for you and all components are known to work well together.
Buy retail and that is not always the case.
Lots of great small companies that produce great gaming machines.
Lots of examples here of folks with top spec. PCs but having issues.
IMHO often because components arent chosen well.
But what do I know, I am just an old IT sppecialist with 30 years experience. 
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