I want a canon dslr any suggestions?

I have a Canon Rebel xsi. I know about the 7D and I jumped and bought the manual. I'm thinking of the t2i...... please help. I don't know what cameera body i should get! I really want a long zoom lense, but that will come after i buy the camera. My rebel xsi is fairly old. I am definetly in need of an upgrade!