HottKitz definitely has the best drums, samples, loops out there. They have several Dirty South slash Down South type of hard hitting 808 drum kits. They even have custom made kits in the style of other major producer such as Drumma Boy kit, Shawty Redd kit, Lex Luger kit, Zaytoven Kit, etc., etc..
This is exactly the style that you're looking for to get those low end 808 subs.