I don't think this has been mentioned yet, if you are getting an SE or Ti without the special color trim packages (Tuscany Red, Arctic White) the center console 'brightwork' will be a darker color silver in the Ti than in the SE. Also the 'J' shaped piece below and above the cupholders is interior color in the SE and is the dark silver color in the Ti. For 2013 models anyways. Same thing for the tiny silvers pieces on the doors near the window controls.
The big differences have already been touched on, primarily the differences are available options, minor trim piece improvements (padded door sills, all windows auto-up/down), and superficial stuff like the chrome accents inside and the chrome hockey stick along the doors.