Men! I can relate, my DH suggested names that I thought were dull or very 1980's lol!

It sounds promising that you are both liking Benjamin. Some of my random, off the top of my head suggestions:

Oran
Rowan
Ewen
Owen
Rueben (I think we have a rhyming theme happening here so far!)
Ronan
Jeremy
Morgan
Bailey
Kyran
Zachary
Angus
Luka
Asher
Hamish
Torren
Micah
Finn
Zephan
Ethan
Aaron
Taj
Tobin
Flynn
Tallon
Riley

Good luck!