I am 6', 200 lbs. Sportbikes are painful after more than 20 minutes. They are not designed to fit people like you or me. Look at Ryuichi Kiyonari, or Valentino Rossi. Sportbikes are built to fit them. And, they are in prime physical condition. You and I, real men in the real world, just don't fit on those things.
And I don't think you comprehend just how dangerous 140 hp and 100 ft-lb of torque on tap can be. My favorite mount, an 85' FJ1100, can hit 60 mph from a dead stop before I cross the intersection. That is slow compared to modern R class bikes. A modern R class bike, is so far beyond the average riders ability, that most street riders barley use a third of the bikes potential. And it is suicidal to give that kind of power to a beginner. These things are so smooth and so capable at speed, they lull you into a false sense of control. So when you think you are able, you find yourself in way over your head in a panic stop situation. Be sure to sign the donor section on your license.
Sure, they have gobs of power, but where can you use it? 160 mph is not that scary in a vette, but is scary on a machine that weighs 500 lbs.
And you can't expect to buy just one bike in your entire life. You are a beginner, you are going to drop it. It would behoove you to shop for a Maxim 650, or Nighthawk 650, anything along those lines. Something older, cheap and durable. You go out and drop 12k on a new ZX, you'll find out how expensive bodywork is to replace.