It depends on what you want... The 2012 has the newer V6 which is a great motor and has gobs more power than the older V6's.
With that said you gotta weigh out what you want... In my opinion I would rather spend less money on the car, so for example get an older jeep and then mod the piss out of it rather then spend all that money on a newer Jk.
Or, if it was going to be my DD I would probably get the unlimited JK because it rides better and has a lot more space than the 2dr.