Lat blends were what got me interested in the pipe. I came from a cigar background and was intrigued by the campfire/bbq thing going on, especially in balkan blends. Over time i went through the gambit; next discovering and falling in love with VA/pers, then pure VAs and eventually settling in with those and the often more satisfying burley blends. However, even though i've never came back around to the full balkan stuff once discovering the other experiences available in the VA/Burley worlds, there is still a place in my smoking regimen for a few quality lat blends. These days they tend to me, as you said, more in the mild-med lat range with plenty of supporting tobaccos.
Like you, i enjoy the local SPC blends such as Mississippi River, for instance. But to name a short list of others, if you still want to explore:
C & D Epiphany
SG Perfection
Gatlin-Burley
Still smoke these on occasion and still excellent, particularly in a morta (of which i own 2 just for such occasions).