I like the one her husband picked too. A curved band with stones seems like a good idea.

What about this one?
She could have the plain wedding band AND a blingy anniversary band that would sit flush against it. It is still low set and simple. ???
http://www.moissaniteco.com/4prong-heavy-low-profile-round-moissanite-solitaire-ring-p-8227.html
Perhaps the head could be changed out to something with double prongs for a bit more flare??