There's one addon that brings everything you need. It's called FSX
Milton's planes work very well, and Tim is only creating planes for FSX now. As for the VFR and low-and-slow flying, sceneries made by OrbX and Holger Sandmann will amaze you.
Appart from this, if you really want to stay with FS9, I would say that the FS9 sceneries from Holger Sandmann, payware and freeware (Glacer Bay, North Cascades, Mysty jords etc...), are what you are looking for. The freeware HDE clouds package from Pablo Diaz will give you a very nice sky, but if you prefer payware, I suppose REX might suit you better.
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