Thanks for the advice. I've gone with the 16gb S4 with a Samsung UHS1 64gb card.
I was all set to root it and then noticed that the update that had automatically gone on, had changed the kernel and baseband. Apparently the new baseband version (ending in MDM) is not rootable. Anyone know anything about this.
edit. Things are moving quickly - LINK
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yeah I was going to say, things don't stay locked up for long lol

iirc the US versions have locked bootloaders and they've beaten the international version to official nightly ROM support so I wouldn't pay too much attention to any of that.
Good luck! I can wholeheartedly recommend wanamlite ROM with JB Domination, holo locker, nova launcher and then trim everything with nobloat free. I have almost no touchwiz at all and where it is it doesn't look like touchwiz!