CBR250 single is an awesome choice.
Honestly, I think it would be a really fun bike to own. You can go WOT every time the light turns green, and you'll never make it past 100mph on the highway to put yourself in real danger of losing your license.
I think i'd put a taller windscreen on it and a steel front brake line, then just burn through tires. A naked version with riser bars would be more discreet than the full-fairings, but I feel like wind-screens look less attractive in that context, and they're greatly appreciated at highway speeds...