If you are going for PhD take Subject GRE.
If you are not very confident to bear the load of the tough courses, go for MS first.
University of Georgia, Athens (UGA) has a good Physics school and I have heard that it is easy to get aid there in MS.
You can find more at http://www.physast.uga.edu/
You can see your chances of getting in UGA or any other university at http://www.missiongre.com