I own a 2012 250 also a 2005 1000 there is a major difference between them the 250 is so light and flick able, the 1000 is pure adrenaline. I agree with Blade test ride both and see which you feel more comfortable on. Remember insurance, gas, tires, repairs all go up in price so keep that in mind when your looking.
Honestly, you rode a 250 as a first bike. Clearly you have plenty of respect for the power of the bigger bikes. If it's a concern of what you'll be able to handle, you already have the right mentallity. Anything you would do to yourself on a 1000 you can achieve in the same manner on a 600. If you want the 1000, go for it. If you have a riding buddy who has a 600, I'm sure he would let you ride it rather go for the > to get rides on < occasionally.
If you have good experience on the 250, and you're mature enough you might be able to handle it. Be warned though: if you so much as crack the throttle open just a little too much in a turn you could wipe out...1000RR's are not very forgiving.
And you'll get a bit more gas mileage out of the 600RR.
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