Considering your requirements, we would recommend you take a look at the Royal Enfield Classic / Bullet 350 and the Honda CB350 models because they are comfortable for two-up riding and have decent power. If you are open to an adventure bike, then the Hero Xpulse 210 will make for a good buy as well, although keep in mind its seat is a little narrow, which can feel uncomfortable on longer journeys. Take a test ride of all the machines you're considering with your pillion before choosing.