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?

The Ninja 650 is a sporty-standard that hasabout the same power/torque value as a HD 1200 Sportster.

Good choice, fast enough but not too far, so go from there.

A Sporster is not really that fast of a bike. Any 650cc standard should be abut in that class. As Chris said, you don't want a sport bike, you want a 'sporty' bike. The Ninja 650 is great, they're certainly very popular! Or you could look at a Suzuki SV 650, or a Yamaha FZ6R, which is 4-cylinder. There a lot of bikes in that category!

Your rebel 250 is probably pretty close to the Sportster in terms of speed and capability. The sportster is going to out accelerate the rebel and have a bit more speed, but its no sport bike.