Good first time bike for newbie rider?

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Ok well im 6 ft 255 pounds, and im tryin to lose weight so it will go down. I have riden once before. Im 17 now and when i was 16 my cousin let my ride his Ninja ZX-10R, i was in front and he was on the back. He still held my hands as we went , but i did everything. accelerating braking, shifting, he was just holding my arms steady so that i dont rip it, and we lose control. He said i did a really good job.

I was thinking of a Ninja 650R, i dont rly want the 250 like at all. And i been eying the 650 so much. Is this a good bike for me?
Also i forgot to say, i am responsible, dont fall into peer pressure, ( if someone was to tell me to speed etc...) and im not stupid, im gonna treat it good and not mess around on it
i want a sports bike not a chopper