Anything technological nowadays is almost pointless waiting around for the next best model/upgrade etc etc. because this technology moves so fast, whenever you buy your new model, whether it be at the very release of it, or a few months after, something improved is gonna come along pretty soon after. So when you find something you're happy with, be it a digital camera, computer, tv, or whatever, buy it while you can! You might as well, you're gonna have it when you want it, and once you have it and find you're happy with it, i doubt you'll be thinking at all about what else is coming out (unless you're very rich) for at least another year.
Good luck with it :-)