To be honest with you bro, I felt the same way quite a few years ago. I purchased a '96 CBR600 F3, as my first sportbike. I had it for about a month, before I felt like I was getting bored. I thought I was ready to go up to a larger bike.
I wound up hanging on to it, though, as soon as I realized there were a lot more things involved than going fast in a straigh line. I found it was a hell of a lot more fun, trying to perfect 4-gear wheelies, and stoppies, and then rolling stoppies, and then....
The point is, if I'd given up my 600 and traded it for a 900, I probably wouldn't have learned quite as much as I did. It's a hell of a lot easier to learn those kinds of things on a smaller displacemnet bike, than on a lot of the liter bikes. (Except for the 60 and 70-mph stand-up's on the highway, they seem to come up a little easier when you've got a lot more ass behind your wrist.
Don't be too quick to ditch the little bike, until you're sure that you've learned to ride it to it's full potential, (which most people, including myself, probably can't actually do).