There are dozens of addons that "display stats". Could you be more specific about how you want them to be displayed? Are you looking for something to plug into an info bar (like FuBar)? Are you looking for something that will show stats in a window that's always on the screen? Etc.
Well you could easily reposition the default font strings to appear in a different order, though I'm kind of curious why you need to change the order? You can have two stat panels shown at once, and which ones are shown is saved between sessions.
Right, but what's wrong with the stat panels that are already shown on the character frame? If you want to see, say, both crit chance and resilience, set one panel to show Melee stats and the other to show Defensive stats. The game will remember which panels you had showing, even between logins.