Root help anyone

I made the jump in went to the Razr HD from my rooted/romd x, this phone is great but it would be better if I could rooted and do my own thing. I know there's a few root tools out there but I need to know what the right 1 is for my OS. I'm running ics 4.0.4 now. I just got the phone yesterday and I need to do this before I update to JB because I hear that it's a hard route to follow after the update. Can anyone point me in the right direction.?

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