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the C6606 is teh one tmobile sells and will work on att and tmobile no problem. it does however come with a locked bootloader.
the C6603 is the international LTE enabled variant and will work on just tmobile spectrum (as in wont work on att or carriers that use att's stuff). this is teh most widely supported device.
the C6602 is the international HSPA+ device where it will get hspa+ on tmobile but wont get ya LTE.
my suggestion is the C6603, i had the c6606 for a bit and its a nice phone, but the locked bootloader and overheating really wasnt fun
if youd like an unlocked bootloader the z1 is an amazing device to have. dunno if they have cm on it yet though since teh 4.3 update finally fixed teh bootloader issue they had.