I am about to buy a Canon Rebel XTi, but I am not sure what lenses I want to purchase for it. I want something that will take nice crisp pictures and be able to zoom in on wildlife etc... from a ways away. I dont want to spend a rediculous amount of money on one, but I don't want to be cheap either. I was thinking a 70-300mm between 200-600 dollars. Anybody have any suggestions?