The only reason someone should upgrade a camera is if they are truly feeling held back with what they currently have/need something better based on client demand. After looking at your most recent edit, you're not even close to that point. Getting a 5d or whatever you plan on upgrading to is not going to make your edits better all of a sudden. I'm not trying to hate on your abilities, i'm just trying to tell you that blowing an extra $1,000+ is not a smart decision. Spend an extra two years or so with your t2i and then think about upgrading.
If you want to move away from dslr/interchangeable lens cameras that's a different story.