Alan Carr is an avid aviation aficionado learning about the aspects of the flying world from the business to the technical, while also frequently writing on what he finds. He currently works with Globalair.com to provide resources on aircraft related information.
The Citation X has been in production since the early 90's and has established itself as a top of the line speed demon with luxury. The early models are not very fuel efficient but with updated mods they hold their own at around 0.92 mach. Pricing varies as with everything but older, higher time airframes are asking 3.6 million and of course new models from the factory are in the mid 20's. You can see a list of them for sale here: http://tinyurl.com/aendzar