CARS?MOTORCYCLES??
The Kawasaki.com site is the best place to SEE what you are getting into. basicaly the
Ninja ZX-6R...Liquid Cooled DOHC 16-Valve 636cc In-Line Four, Hi-Performance Ram Air Induction, Digital Fuel Injection w/38mm trottle bodies, digital ignition, 6 speed gearbox with Positive Neutral Finder, pressedaluminum/cast aluminum perimeter frame, fully adjustable 41mm inverted Cartridge fork, Fully adjustable Bottom-Link UNI-TRAC (tm) rear suspension with piggy-back resivior shock, 120/65 and 180/55 Z-Rated 17-inch Radial tires, dual 280mm semi-floating front disk brakes with radial-mounted 4positin calipers, middleweight performance champion, and it comes in four colors.
The Ninja ZX-6RR...Updated liquid cooled DOHC 16-valve 599cc In-line Four, Championship winning power and performance, Signacantly increased peak horsepower nd n torque, new Digital Fuel Injection with 38mm throttle odies, 32-bit digital ignition, Closer ratio 6-speed gearbox with back-torque limiting clutch, fully adjustable 41mm inverted cartridge fork with DLC (Diamond-like Carbon) coating, updated fully adjustable Bottom-Link UNI-TRAK rear suspension with piggy-back reservoir shock, dual 280mm semi-floating front disk brakes with radial mounted 4-piston clipers, improved performance delivers higher power-to-weight ratio, and it only comes in Kawasaki Green.
ZZR 600 Liquid-cooled DOHC 16-valve 599cc in-line Four, Twin Ram Air Induction system, 4 36 semi-downdraft carbs with semiflat slides, TCBI Ignition with Digital Advance, 6-Speed gearbox with Positive Neutral Finder, Pressed-aluminum/cast aluminum frame, 41mm fork fith adjustable spring preload and rebound dampening, bottom-link UNI-TRAC rear suspension with adjustable prelaodand rebound dampening, 120/60 and 160/60 Z rated 17-inch radial tires, dual semi-floating front brakes with 4 piston calipers, middleweight sport touring performance, only comes in Metalic Ruby Red. The ZZR 600 has a true two person up saddle.
Personally, I prefer the 2 Fuel injection models over the carbs, but that is a personal choice. some people prefer carbs...and the nice plush seat for a passenger. The best thing to do is to go to the Dealership and set on each of the models and then think about how you are going to use the bike. Check out the insurance in your area, and ask SEVERAL maintenance shops which of the bikes give them the least amount of trouble.
You may wish to ask the moderator and sponsor of this site for their opinion...afterall, this web is available only because of them...