I think
Reuben sounds wonderful. Doesnt sound terribly trendy, so hopefully there wouldnt be a ton of them by the time the kid grows up. I think family names are a great way to go if you like them, because it just has a special meaning to you and everyone in your family. Two out of three of my son's names are family names that I happened to like, and some people may think its cheesy, but I love it! Maybe pair
Reuben with something you really really like, such as
Reuben Gareth,
Reuben Jonas,
Reuben Liam,
Reuben Tobias