I run FSX very well on my system with lots of payware add on's. It's all about the setup. personally, my shopping list for a very nice FSX system within your budget would be.
YOUR BASKET
1 x msi geforce gtx 680 oc twin frozr 2048mb gddr5 pci-express graphics card £479.99
1 x asrock z77 extreme6 intel z77 (socket 1155) ddr3 motherboard £169.99
1 x intel core i5-2500k 3.30ghz (sandybridge) socket lga1155 processor - retail £161.99
1 x western digital caviar black 1tb sata 6gb/s 64mb cache - oem (wd1002faex) £109.99
1 x crucial realssd m4 128gb 2.5" sata 6gb/s solid state hard drive (ct128m4ssd2) £105.98
1 x corsair enthusiast series tx750m high performance 750w '80 plus bronze' modular power supply (cp-9020003-uk) £86.99
1 x antec kúhler h2o 920 high performance liquid cpu cooler (lga775/lga1155/lga1156/lga1366/am2/am2+/am2+/am3+) £84.98
2 x kingston hyperx genesis grey 8gb (2x4gb) ddr3 pc3-12800c9 1600mhz dual channel kit (khx1600c9d3x2k2/8gx) £44.99 (£89.98)
1 x samsung sh-s222bb/rsms 22x dvd±rw sata rewriter (black/silver/biege) - retail £19.99
total : £1,322.48 (includes shipping : £10.50).
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add a case of your choice.
everyone knows how good a chip the i5 is, and with that cooler you should be able push 4.8, which is a major factor in fsx performance. i would like 16gb of ram because, depending on the way you use your system, sometimes, with only 8gb, it's quite easy to only have a gig or so free with all the bloatware that pc's seem to run in the background these days.
one thing you could do if you had the money would be to add a smaller 64gb ssd for the os and use the big ssd for your fsx and add on installations.
i mean we are talking probably overkill here, but if you have the budget, why not. also a lot of fsx performance is in the setup as well. when setting up, print this out and have a follow. it's very good.
http://www.simforums.com/forums/setting-up-fsx-and-how-to-tune-it_topic29041.html
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.
http://forum.avsim.net/topic/354911-intel-core-i7-3930k-48ghz-wfsx-quick-review/
your budget is 3K so go 3930K (I'm running at 4.8 on a 3930K using an H100)
1 more important fact worth noting, I mentioned this in the official FSX thread already:
For anyone interested in investing both money & time into flight sim, then also look at Prepar3D as well as FSX. Basically, Prepar3d IS the FSX code/engine but further developed by Lockheed (IIRC). From what I have read, pros) Coding is updated but more in reference towards serious flight sim aspect of it not so much towards steamlining GFX etc, however, although FPS difference between the FSX & Prepar3D is only slightly marginally better (and only in some cases), texture handling is better thus less cause for blurries, many swear that it seems to be smoother flying. Plus another huge pro is that they are constantly working on it, so perhaps in the near future, the gfx might get a big update. cons) although the same code/engine, most of FSX 3rd party addons are not yet fully compatible with Prepare3D, but some recent ones are. So it is not ideal for people who are already heavily invested into FSX addons. For anyone starting, this might be worth a consideration, perhaps even get FSX now but hold off on buying major addons for a while and see where this Prepar3D goes.
So think it is worth keeping a close eye on this, cause it might just be the next step after FSX, especially if nearly all addons become a simple port over.
Apparently they won't be coming out until 2013 but I don't know much about it I'd buy one though regardless if you're planning on buying it this month anyway + other sims out there will make use of it if you happen to play some of the competition.