I'm not sure I understand your original question. Does your PS3 have an HDMI output? If yes, use that. RGB and component should not be involved with this hookup or decision. If not, either of the other two will be an improvement and true HD even at 720. Your TV will scale a 1080 source to fit the screen. Since I don't have a PS3 I'm not sure how they present their options so I will let another PS3 owner address your issue better. Out of curiousity, why do you want to scale to 720?
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