superbike : anything above 250cc.
Superbike can range from touring bike, sportbike (R1,R6 etc).
For daily commute can go for versys, or maybe KTM Duke 690. Yes, its not a sportsbike that can go 300km/h, it can only go for 200km/h, at 180 km/h its already uncomfortable due to wind since it doesnt have proper windscreen, but its damn fun for town and good enough position for touring up to 180km/h.
Maxi scooter looks like a higher maintenance, but if i were to use it for daily commute, its quite good..better wind protection (rain as well since it's a scooter,so ur shoes not easily get wet). But, those maxi scooter are expensive, and yes the belting is the downside in scooters, but with any vehicle, with proper maintenance it wont be a problem. Even a chain drive bikes wont last long if you dont properly maintain it - like lubricating it now n then, and adjust the tension etc.
Anyway, yes ER6N/Versys is a good choice for commuting plus it has a large support in malaysia (all kawasaki is). But, if i were you, i will look for something different, not that ER6 is not a good bike, but its too common. I will totally recommend Duke 690.