Ahh, I love the softer names, too!
Some of my favorites:
Jack (not quite so soft, but I think it can be)
Valerian/Aurelian/Florian (almost too feminine, though, maybe?)
Sebastian (some stronger sounds, but it really has a softer image to me)
I like the suggestions of Micah, Joshua, and Owen, too. And I love Asher, Rhys, and Noah (and even Julian) on your own list.