There’s lots of riders who ride their 250’s for years before moving to a bigger bike.. It all depends on your learning curve.. The Ninja 250 is more than able to ride at freeway speeds.. Unless you’re wanting something that will do 100mph +.. The 250 is a great starter bike as far as sport bikes go..
As for turning around and selling it when you’re ready to move up, don’t worry about it too much.. 250’s usually hold up their value and they usually sell fast.. There’s always some new guy looking for his first bike..
I read the review on the 09 FZ6R and although they said it was a good “starter” bike.. A. I think for sport bikes, 250 is a much safer way to go for new people (Though on a cruiser I think you can go up to a higher cc bike to start with). And B. Personally I wouldn’t want to spend over 3k for a first bike.. Odds are you’re going to lay it down a couple times while learning..
Dagger