If I was due for an upgrade, what I would do, pick up the s3, root, get rid of TouchWiz and flash jb on it. Had to do the same to get rid of sense
If you rather not root, another alternative would be get an alternative launcher like apex and apply ics or jb theme that would give it the gnex feel. Works out since GS3 is due for a jb upgrade from what I hear.
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