Do you guys think this is a worthy upgrade? Ive had a S3 for about 9 months now. I bought that full price and now I have a free upgrade (still need to pay 200) on ATT. I am debating between this or the S4. Im really into techs and I feel like upgrading to the S4 is going to be boring for me. Im digging the audio on the One, and the solid feel of the phone. Should I wait for something down the line...or would people say its a big enough upgrade to use the att upgrade on this ONE?