312 if you want to keep it fairly simple, or 320 if you like the GMT functionality. The 320 also has a small power reserve indicator on the back of the movement, and the 'zero reset' stop seconds. The GMT hand can be hidden behind the regular hour hand for a cleaner look
The 233 is a great PAM, but a different kettle of fish (more complicated, manual wind) and much more expensive
Personally I don't like PAMs on bracelets - just does not look right to me
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