Hi all, I am having trouble deciding on which camera to buy. I currently own a little Sony but would like to get a lot more serious with my photography, cause i thoroughly enjoy it so much. Have been looking around for a month now and have found 2 that i am interested in. I'm tossing up between a Canon 550D and a Nikon D90....Can anybody give me some advice on the two i have chosen of even recommend another camera for me to look at....any help would be greatly appreciated.... Tammy.