Aww pretty ring...
I would suggest #2 or #6
Because #5 washes out your wedding ring because your ring wouldn't stand out if you had the same cut for your actualy wedding ring and the engangment ring...
trust me, I have an uncle who nags all the time about "this and that...that goes well with that...blah blah etc etc"...yea its because he's a jeweler, plus my mom who's like freaking "RING-CRAZY"
hope that helped....and CONGRADULATIONS
(did i even spell it rite)!!!