Unroot questions, mainly to get a new phone.

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http://androidforums.com – My TB is over a year old, got it on launch. Cracked screen, Can't figure out why it won't fully charge. Have insurance and nothing good is coming out soon. I can unroot but what is the replacement phones like? Can I still root them with revolutionary? I'm tired of this charging problem, the thing will just stick At X percentage and jump up if I reboot, and never gets passed 80 percent anymore (extended battery). Thanks (General)