Why dont you get the car/truck first. A sub setup will be completely differant for a car with a trunk than a truck with no back seat. You dont even know what size speakers- 6x9's are more expensive than 5". Will the car need an amp bypass? Will a dashkit need to be made? What the hell is Dual and Crossfire? I can crap in a box and give it a real warranty from my real ass. Theres way too many variables to pick a system without knowing what kind of car. You can build a very nice system for $1000- front and rear coaxials, deck, sub/amp/box, wires and install. Be prepared to spend up to $1500 though cause youre gonna hear something more expensive that youll like. That is all.