Why do people buy low sensitivity speakers? Oh well, 90 is not the end of the world. Since you want intimate and are not concerned with head banging volume you already have the amp on your list- the Raven Blackhawk. Cannot be beat, especially not for what you are doing.
But next time, please, nothing under 92. And 95+ is even better.
But next time, please, nothing under 92. And 95+ is even better.