I would go with either a 5513 or a 1680 (depending on whether she wants a date or not)...just remember to buy the seller and to buy quality. While a relumed dial or aftermarket crown is fine on a rep, when it comes to vintage rolex, you want all original...no aftermarket and as little service parts (at least ones that you can see...dial, hands, insert, crown, etc.) as possible.
I will also throw in a 1675 into the ring for consideration because with the ability to have a Pepsi and all black bezel, you have almost two watches to choose from (plus, the 1675 are a thinner watch than the subs).....
Good luck, just remember to buy the seller.. There is nothing wrong with buying/wearing a rep, but you don't want to get a rep when you think you are buying gen!!
Tom