The Heavyweight contenders in 4A in my own opinion are as follows:
Lowerstate: Irmo, Wando, Socastee, Hilton Head, Summerville
Upperstate: Aiken, South Aiken, Northwestern
There are an unsung amount of "sleepers" this year in 4A, too. I feel that Dutch Fork is the main threat in that sense for the lowerstate. For upperstate, I would have to say that Spring Valley and Ridgeview will both be playing the sleeper role. This year's playoffs should be very competitive, and I can only wait in anxiety for them to get started!