I gotta agree with the majority here....
REMINGTON ALL THE WAY!!!!! 
I have a lefty version Remington 870 Express Mag 12GA. It has
NEVER failed, jammed, or just " acted funny" in any way. It does everything for me - ducks/geese/turkeys/etc... I don' t have a deer barrel for it though, as I use my PSE bow for deer hunting.
Get the 870. Believe me, you won' t be sorry!
Butch