Cafe racers are known for many things, but comfort isn't one of them - we must clarify this at the outset before we proceed. Since this is going to be your first motorcycle, we'd recommend getting a roadster or street naked because they will be vastly more comfortable and usable. 

As a first bike, there is a litany of good options from Honda, Suzuki, Yamaha, KTM, TVS and Royal Enfield. Look for something around the 25-30hp mark ideally. 

If you really have your heart set on a cafe racer, the only two options in your budget are the Triumph Thruxton 400 and the Royal Enfield Continental GT 650. Both are quite powerful and won't be ideal beginner machines because of their committed riding positions. The Royal Enfield is also a rather heavy machine, which won't be easy to manage due to your stature.