"Zoroel, Sabriel, take this from me." And. It went.
These two angels have come through for me in work I have done for family, in particular my mum when she'd be ill for a while. Some of the NAP spirits just come through so quickly. Its also a nice way to get acquainted with the Shem ha-Mephorash and older Solomonic angels found in some older grimoires I am less inclined to work with at the moment.
The three in the General Purpose chant are amazing too. There again...I've only ever called on them for helping others.
Have you checked out the thread here that has all the entities listed and their historical background? I don't have Davidson's
A dictionary of angels so it's pretty handy having access to the list rather googling and checking the legitimacy of the pages we find.