I don't see why you would buy another bike at this point. You just started riding, and you already have a nicer bike to start on that most people. You also have more than enough power than you need as a noob. The main thing you would be getting from an s2r800 or a s2r1k is more power. So, just put that money in your pocket, be content, and get out and ride.
My two cents.
I'm just restless and get the itch to look at other things.