Go to sprints international coverage portion of their website. Look at the countries you frequent. Quite a few developed nations have CDMA roaming so you would be fine roaming with the SIII.
If you can hold out a bit longer and want an android world phone, a new high end motorola device is coming out this month, Motorola Photon Q LTE. It is geared towards business travellers. The SIM slots will be locked so you can not buy local SIMs overseas, but you will have GSM roaming internationally through sprint using the embedded SIM card. The phone does have a hardware keyboard if that interests you.--
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