The Flight master reccomends: Hardware that can overcome microsofts lackluster coding and programming that plagues FSX. In other words, the top snot. State of the Art. the best of the best. the golden gun. The easter beagle. The Last Word. momma's home cooking. the big cheese. Andre the Giant. getting the idea? lol In other words:
Intel Core i7-970 Gulftown 3.2GHz OC to 4ghz or more (or better like i7 extreme if you have 500 bucks more than 500 bucks.) 6 x 256KB L2 Cache 12MB L3 Cache LGA 1366 130W Six-Core Desktop Processor BX80613I7970
G.SKILL Ripjaws Series 12GB (3 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9T-12GBRL
ASUS Rampage III Formula LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
MSI N580GTX Lightning GeForce GTX 580 (Fermi) 1536MB 384-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card. gonna need 2 of these bad boys
In other words, spend about 2000 bucks. If you dont want or cant spend 2000 bucks on a gaming rig then you are sorry out of luck if you want to get the best experience possible, and use a bunch of 3rd party add ons such as FSdream teams beautiful airports and scenery.
In other words, its all about how much do you really want and or desperatly need FSX to live up to that key word in the middle, "simulator"?
Me myself personally, Id rather spend 5000 - 6000 bucks on addons and a good rig and get the simulator to near simulator status than spend 350,000 on a outrageously priced cessna 172.