After much searching around, finally landed with this lovely AP Royal Oak 15300st. Been considering between the 39mm against the 41mm 15400. I think 39mm suit me fine.
The 15300 comes with calibre 3120 with 60 hours power reserve. (same movement with 15400). Close examination of the crystal caseback it seemed like the 39mm case is already too big for the intricate movement. Love the Gold Rotor which is really charming.
The white Tapisserie dial looks much better in real life than from the picture shot. it match nicely with the date window colour.
Some pictures for sharing