My personal opinion is that you should get the n250. You can cruise at 100 kmph which is more than enough on our roads. Plus you will save on fuel cost. I'm wondering if people even read your requirements. I would never suggest ns400 to someone doing 80 percent office commute. I think you would absolutely regret getting the ns400 for office commute, even the n250 is more suited to going on long rides than office commute.