Ya, I'd like to know too. Cuz I plan to sell mine

Hmm I was thinking of changing too since my friends (& families) mostly use Nikon but like what Kysham said I don't see the point in going through the hassle of selling and then most probably losing some money in the process in order to get another system. I feel it's more worth upgrading lens and if it is so bad I'll still keep this camera as 2nd body and buy Nikon or Canon (which I doubt will happen unless I win the lottery)

Then again if you wanna change now you should change now so that if you wanna change later you wont lost MORE money you see. So it all depends on you =)