I didn't have much deep soul before owning these, they were my gateway to the slower deeper stuff.
I then went out and got the Eddie & Ernie, Kelly Brothers, Wallace Brothers, Kings Serious Soul 1 and 2 and Jean Wells CDs. More recently I got the Spencer Wiggins, Howard Tate, Candi Staton and Doris Duke CDs on Kent.
If pushed I reckon I'm more of a deep soul fan than northern fan these days (due to not being able to get out much and doing a lot of home listening).
Greatest deep soul 45 record of all time for me is Theola Kilgore's cut of "The Love Of My Man".