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Please see the official X‑Plane Support page for help.
I don't know where you live so I cannot direct you specifically to a particular company. Further more I don't have any connection with these companies.
If you live in the USA have a look at the systems developed for flight simulation by X-Force PC. This company is the recommended company for the supply of PC's by Laminar Research. They have many variations on packages for flight simulation. They will also custom build for you. If you live outside the USA freight charges are quite high.
Considering that I live down under so how do I know? Have a look at the following link providing several YouTube videos. Michael discusses many of their packages as well as providing other good information. The link is at https://www.youtube.com/user/col2mab/videos?sort=dd&view=0&shelf_id=0
If you live in the UK have a look at a company called Wired2Fire and can be found at http://www.wired2fire.co.uk/flight-sim/x-plane This link shows their X-Plane systems.
On another forum it has been said this company is "first class" particularly looking after a customer's needs.
Hope this all helps.
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