Also, if you want to compare size difference, use this website for a quick comparison:
http://www.displaywars.com/
As an example, a 60" TV in a store looks pretty big. A 104" screen with a projector is 3x the viewable area of a 60" TV.
An 80" TV in a big box store usually looks enormous. If you can fit a 113" screen in your room, it's twice as big.
You'll regret it if you don't get a projector.