What is the fastest, longest range plane a person can buy?

How about a private jet with maybe 20 capacity, crusing altitude 50-60k ft at mach 3?

Other answer:

vic:
Commercial airliners are not usually something purchased by a private individual. But if you are filthy rich then you may well be able to afford to buy a business jet.

If so then the Gulfstream 650ER would probably be at the top of your shopping list; it has a range of up to 7500 nautical miles at Mach 0.85 or if you push it to Mach 0.90 the range is up to 6400 nautical miles. Those mileages convert to 8630 miles and 7365 miles respectively.

Simpson:
Given your specification in the update, no such aircraft exists or is ever likely to.
williams:
Given your specification in the update, no such aircraft exists or is ever likely to.
dashner:
Speed costs money. How fast do yo want to go?
Angela D:
any of the long-range airliners (e.g. 777, a350) can fly from anywhere on earth to anywhere else on earth, nonstop. boeing and airbus both offer business/vip configurations for private ownership.
Quinn:
Speed costs money. How fast do yo want to go?
Eric West:
Given your specification in the update, no such aircraft exists or is ever likely to.
Robert:
Speed costs money. How fast do yo want to go?
wg0z:
pick speed OR range. you cant do/have both at the same time.