For a more common off the shelf computer, try a full Apple Macbook Pro, comes in at $1,199.
The most expensive Macbook Pro is $2,499.
Mac ProPart Number: Z0EM
Two 3.2GHz Quad-Core Intel Xeon (8-core)
32GB (8 x 4GB)
Mac Pro RAID Card
300GB 15,000-rpm SAS
300GB 15,000-rpm SAS
300GB 15,000-rpm SAS
300GB 15,000-rpm SAS
NVIDIA Quadro FX 5600 1.5GB (Stereo 3D, two dual-link DVI)
Two 16x SuperDrives
AirPort Extreme card (Wi-Fi)
Quad Channel 4Gb Fibre Channel PCI Express Card
Apple USB Modem
Apple wireless Mighty Mouse
Apple Wireless Keyboard (English) + User's Guide
iWork '08 preinstalled
Final Cut Express preinstalled
Aperture preinstalled
Logic Express preinstalled
Accessory kit
Each company offers its own array of expensive computers.
Dell now owns Alienware who has some of the most expensive and fastest gaming computers on the market.
Apple has the Macintosh desktop which can cost in the tens of thousands but isn't necessarily the fastest machine in the world.
HP offers the Voodoo PC line.
Custom built computers can be faster than nearly any computer you buy and cost you half the price, if you know what you are doing.
supercomputers
P4
According to TOP500, the fastest computer is currently (as of September 2017) the Sunway TaihuLight, at a speed of 93 petaflops. I don't know whether this is also the most expensive computer.
supercomputer
super computer
Super Computer
The fastest would be the most expensive computer right out of the factory, then overclock it to make it even faster, would probably be the fastest until the next computer was made from a factory to top that. Try Alienware computers.
The World's fastest, most powerful and the most expensive combat aircraft is the F-22 stealth raptor.
Most expensive car in 2013 is Bugatti Veryon.
i think it is Dodge Tomahawk the most expensive and fastest bike in the world...
The most expensive cars in the world are the fastest, Roket powered cars.
probly a mac.