I won't treat you like a New Rider since you've been on the street a bit. But I will contest the idea that you'll outgrow a 600. That's nonsense. If what you mean is that you'll get bored with how fast off the line it is, well then perhaps, but you might as well consider jumping all the way out to a 1600. And no, I'm not recommending that nor do I think its a good idea.
If you're into leisure riding I would argue that NO
supersport bike is right for you. You'd be better off with other "sport" bikes like an Interceptor, F4i, Z1000, SV650, 650R, etc, or even better, a sport tourer.
Additionally, wrists shouldn't hurt when riding because you should be gripping the tank with your legs and using your abs to help hold you up. Your hands are not on the bars to hold you up. This is a common misconception. If you recall from your MSF class, your elbows should be at least partially bent at all times so you can leverage the bars in either direction without shifting your whole body around just to take a simple turn. Well, that's pretty damn hard if all your weight's on your wrists. This whole situation is far less difficult on bikes designed for the road, which I identified earlier. Supersports are designed for the track, not really the street.
All that said, it is my opinion that a liter bike (1000cc or more) would be a poor choice. Further, dropping and crashing a supersport is VERY expensive because the body panels are muy expensive. Standard sports are less costly up-front, in insurance, and in repairs.
Oh, and welcome