Just to add to my previous spec:
There are many choices for a motherboard and whether to get an i5 2500K or i7 3770K, I suppose that it all comes down to how much you want to future proof your build and if you have any other uses for the system than FSX.
You can fit nicely in the £2000 budget if you get the Asrock Z77 Extreme4 board, that fits nicely in the white and black scheme I chose for you, and downgrade from the GTX 680 (that is IMO a huge overkill) to a GTX 580, like this EVGA.
Cutting down on the monitors is also an option but I highly recommend some quality IPS panels, as big as you can get. If 3x24" are too large for your needs, get one 27" or 30", preferably Dell, HP or Hazro, and a smaller monitor for additional control panels.
Controller and additional accessories can cost a lot of money so set a budget for that too.
If I run say the PMDG 747-400 at UK2000 London Heathrow with REX, Active Sky and 100% AI traffic (add-on like Ultimate Traffic), what sort of CPU GHz and graphics card capabilities would I need?
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