Since you already own a 150cc bike, it would make sense for you to stay in this same category. Of the options you have shortlisted, the Honda SP160 and Bajaj Pulsar N160 are the ones we’d recommend you go with. Both are smooth, comfortable, stylish and reliable bikes that will give you the fuel economy you desire when ridden sensibly. Another great option in this class you should take a look at is the TVS Apache RTR 160 4V.
Make sure you take a test ride of these bikes to see which one suits you best.