Hey guys, I plan on building a system from scratch when I buy a new vehicle. Im planning on buying a Jeep Grand Cherokee and buying a BC5500d and I will have plenty of space in the rear of the SUV but I cant decide if I want to get 2 12"s sundown x-12s or an 18" SSA Evil. Those subs are just examples, Im not set on any one brand or sub. What do you guys think? 2 12"s or an 18" or something else possibly? Matt