@DecoRider, why would the maintenance be harder on a used one than on a new one? I would say the contrary rather, besides, you could always let a mechanic do the job on a used bike as well.
I don’t know so much about motorcycle enigine’s but I do know some things in general (Was a ship mechanic in the Navy) and that is that a new hi-rev, high-powered engine requires some attending even when it’s new, my guess would be that the first check-up would be after a couple of hundred miles, where one would check valve-play, change fluids, look for leakages and abnormal wear (in general, might be more or less on a specific engine type). This would be hard for a non-specialized mechanic to do since tolerances are so small that they’re hard to find unless you know what to look for (which is the whole meaning of early maintenance, prevention and small adjustments rather than repair)
I would totally go for a used one, as already been said, you loose 1k $ the moment you take the bike outside the dealership.
Dunno how it works on the used-market in US, but in europe, buying from a person rather than a dealership is always preferable. Other than a lower price, you get a better picture how well the bike have been taken care of. A private deal might feel more insecure, but a professional seller on used cars/bikes is often just as much a professional of improvised exaggeration and story telling.
Thats my view anyway. 
