Get a CBR 600 RR or 1000 RR.
Dont get anything under 600. You will get bored in a day.
As for me, I floated he idea which was instantly shot down by my ammi.
After a month, I just brought home the bike. 
After 3 days of back and forth give and take and a solid backing from abbu and my brother, it officially became a part of my toys.
I have a Yamaha R6 600 RR !