If you r looking for bikes in 150cc cat then u can go for Unicorn, yamaha FZ-16 or suzuki.
want to go for more than 600cc then budget should be between 18k - 40 k ........ I remember last month there was ducati ad 2012 model for 18k............... Decide your range and engine and start frequent search in QL, local dealers, mechnaics.....Best of luck ....Happy Biking........