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no matter where the power of your bike is, it shouldn't be a problem if you know what you are doing and respecting the bike.
for city commuting, a 250cc is definitely more than enough.
i am curious as to why you thinking having power in high revs are better in for that second question. how fast would you be turning? most of the time, you would stop and then turn, or slow and without stopping, turn (say around 20km/h). you don't need high revs for that, in fact, you would probably be around 3k-4k rpm.
power in low revs gives you more torque low end. so you can take off easier and easier going up hill. depending on bike, this can be trouble if you are new and panic. for example, if you rev too much and release your clutch, this may cause a wheelie and throw you off your bike (can easily happen on a 600cc vs a 250cc, 250cc is more forgiving on the throttle). if you are turning slow and decide to rev it too much, you can low side the bike.
power in high revs are better when you are up to speed or on the highway. but like above, it can cause problems as well.
like i said, either way, if you know what you are doing, respect your bike, ride within your skill, drop the ego, ANY bike will run fine and won't cause any problems. once you start riding, you will realize what your style is and then can decide what you want in your bike (ie. power in low rev, or power in high rev).
honestly, each bike has a different power band (power in different rpm ranges) and you wouldn't really notice the difference until you start riding and building up experience.
sorry for the long rant, but keep the questions coming if you got em. other than that, i highly suggest you take your knowledge test whenever you are ready and take the course. everything will just start to click.
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