The newer ones get the lovely rear brake light, slightly better forks, paint that scratches if you so much as look at it, the different frame, and fuel injection of course. They make a few more hp, mainly because of the hotter cams. Also, the K3> gets an oil cooler that it probably doesn't need. There's quite a lot of smaller differences but they don't add up to a great deal IMO.
But you're right, there's not a great deal to recommend one over the other- both have their advantages and disadvantages. They handle very similiarly, and while the carbed model loses out on power a little it's not particularily noticable on the street. I chose a carbed S because I think they look far better, no other reason than that- I don't think you'll go far wrong choosing the one that's easiest on the eye and the wallet.
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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