If you're not going to start out on a Ninja 300 or something, IMO, the absolute best starter bike for anyone who is bent on getting a sport bike is the Suzuki SV650. It handles very well, has a lot of torque, sounds great, and I just don't think you'll get bored quickly with it. They're also very affordable and look great. I like the 1/4 fairing where you can see the engine, and the LED strip tail lights still look good after 10 years. They're a VTwin, so they don't rev as high, but OMG DAT TORQUE
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2010 2SS/RS, CGM w/ silver stripes. Hurst Shifter, long tube headers, full exhaust, CAI, tune. SAE 407 RWHP/402 RWTQ
Momma didn't bronze my shoes, but when I turned 16 I inherited a lead foot.