I am 6'2" tall and my weight is 70kg, Which 150cc bike should I buy?

You should go for the Gixxer as it brings the best value for money in its segment. The Gixxer comes with a 154.9 cc engine, producing 14.6 BHP @ 8000 rpm and 14 NM @ 6000 rpm. The bike comes with 5-speed manual gearbox and a very relaxed driving position. The best part of the Gixxer is its attractive price, starting from INR 72,199 for the naked version and going up to INR 84,939 for the MotoGP edition. You can choose the Gixxer according to your need and your taste toward the body styles of the motorcycles. The special edition comes in Triton Blue shade, with MotoGP inspired stickers and paint style. You can enjoy every ride to its full with its large 140 section tyre for the rear and 100 section for the front.

Suzuki Gixxer Series - Gixxer 155, Gixxer SF & Gixxer SF MotoGP Edition

If you want a 150cc, there is always pulsar 150cc and Suzuki Gixxer, otherwise Yamaha fazer and Yamaha FZ-S are also better options. If you want a fully faired bike there are several options like Suzuki's Gixxer SF 150 and Yamaha YZF-R15.

Try YAMAHA FZ-S

I think Royal Enfield 350 (touring bike) would be a good choice for you.. or you can choose hero Honda Karizma ZMR (touring bike)..