Sport bike comparable in speed to a Sportster 1200?

I rode a Honda Rebel 250 for a year and a half, it was my starter bike. Grew out of it and sold it to afford a bigger bike. Rode my moms sportster 1200. I personally want a sport bike, but my mom feels like they are to fast (but she would let me have a sportster 1200.) So my question is what sport bikes out there are similar in speed to a sportster 1200 so she would allow it?

Ps: Been looking at the Kawasaki Ninja 650R she approves of it. How does it compare to a sportster 1200 speed wise?

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