Check out the MiRaGe ROM in the All Things Root Guide sticky. You don't want to use a Froyo ROM or Stock ROM if your letting other people play with your phone. The reason is they both have the factory reset option in the privacy settings. If selected when rooted, it will brick the phone. You need to put the MiRaGe ROM on the phone (No factory reset option in the privacy setting). With the Stock ROM and the MiRage ROM backed up all you have to do to activate is to restore the backup of the Stock ROM, when activated, restore the MiRaGe. You can, and need, to use the "wipe data/factory reset" option in the recovery before restoring a ROM (as well as the other wipe and format options-excluding the format sd card option of course).