Kentucky had a good year, made the sweet 16 before losing 3-1 to Texas (if you recall, they had a moderate upset of the Ags in the 2nd round last year, at least by seed). Tennessee was upset in round 2.
Florida is the best program historically.
At the moment at least, volleyball is one of the weaker sports in the SEC lineup. The sport is dominated heavily by the Big Ten and the Pac 12.