The 7280 is fine, the 7780 is not much better at all, you get some benefits like a bigger screen and a better backlight, but you get the drawbacks of a bigger device, worse battery life and for some odd rerason a non-standard usb connector.
If you look on any forum, you will see people that prefer one or the other, neither is a bad device so theres no need for any buyers remorse about buying one or the other.
Obviously, you could get a bit annnoyed when the 7290 shows up in about a month, but your 7280 will still be a good device as long as you don't intend leaving north america too often anyway.
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