I am looking to get a decent piece of glass, and am looking at the nikon 17-55mm f/2.8. Someone from my chinese school has it, along with a 50mm f/1.4D and a 24-70 f/2.8, AND a D7000(he has almost every lens that Ive ever wanted T-T). I have used it and I think its a pretty decent piece of glass. so is there any recommendations I should go for instead of the 17-55? Also, should I upgrade my body first(to a D7000 or 7100) and save the lens for later? or should I get the lens and wait for the body(am leaning more on this side but not sure)?