I have been flying with FSX for about 1.5 years now. It is incredible how hooked I have become. I just recently built a new PC specifically for FSX:

I7 3770 Over clocked to 4.7 GHz
Navidia G-570
16 GB Ram
256 GB SDD drive
3 27 Inch 1080P monitors, one of them is connected to 1 2nd PC I7 920 16 GB standard clock running Plan-G
FSX Deluxe
Track IR 5 Pro
Ultimate terrain X, Ultimate Traffic 2
Saitek Multi Panel, Radio Stack, Switch Panel, yoke, throttle, and rudders

I'm now considering building a mobile pedestal, on casters, to roll up to my desk. I posted some questions in the IO cards section of the forum looking for advice from experts on various cards to use. I'm seriously considering the PoKeys 56 along with fs Symphony. Please take a look at the post and reply with any suggestions.