Let me just resay what has already been said a ton of times here. I started off like you on a ninja 250 for about a year after the MSF course. I live in NYC so that bike was actually pretty good in city traffic, it was light & nimble. Plus it kept me out of trouble, it could do 85mph if I was riding downhill with the wind on my back.
I upgraded to a 4yr old pampered 620ie for 4 grand. I've had that bike going on 5 years and this bike has been a tank and for 75% of my riding it is more than up to the task. It's that 25% that has me wanting a S2R1000.
If you go with a monster bump up to the S2R1000 over the 800. Used prices are close enough to warrant the extra cash. Like it's been mentioned you get better suspension, brakes, dry clutch and you won't regret it everytime one goes by and you're sitting on your 800. As far as the S4R remember the extra maintenance cost, big power bump, more expensive to buy and for a second bike probably over kill. Plus the 2v Monsters look better (
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