Just my suggestions. Any of these can be swapped based on any kind of preference you have. I left a lot of room because as has been said, with metal you may want to focus more on mid bass. With this build you can try it out and still have left over to upgrade if you feel the need.
If not getting an aftermarket stereo you will need a
I would recommend building your own box. Cheaper and you can typically get better quality materials than a prefab. If not I think this would be an acceptable option. I chose sealed as it will typically give you a more responsive and accurate bass for metal.
EDIT: Most if not all of these items could be picked up on amazon possibly for a bit cheaper. Always keep in mind when purchasing from amazon you may save a little, but you may not have as good of a warranty if at all.