First off, congratulations on starting longer journeys aboard a motorcycle – a fun time lies ahead for you! Now, since you haven’t specified an exact displacement class or budget, it will be tough to recommend precisely.
That said, since you mentioned wanting to step up to the next "cc class," that would be the 160cc sporty commuters. They can handle both city and highway duties, and the likes of the TVS Apache RTR 160 4V and Bajaj Pulsar N160 / NS160 make for solid upgrade options. However, do take long test rides of both these machines, since you are planning to do longer stints in the saddle now.

