Which phone should i choose?

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http://forum.xda-developers.com – Well, i know that it's a little bit dreamer, but, i'm prepparing me if in one moment, this trade up comes up to Argentina. I don't think it does, but, dream costs nothing. In case, if motorola wants to trade me up the phone, which sould i choose? Wich is better? I was thinking the razr maxx hd, because the battery. The phones are: MOTOROLA PHOTON Q MOTOROLA ELECTRYFY 2 MOTOROLA DROID RAZR MAXX HD MOTOROLA DROID RAZR M MOTOROLA DROID RAZR HD MOTOROLA ATRIX 2 Btw, when you change the phone, you have to pay the two years contract with the carrier? (HowTos)