Just a few questions from nooby.
 

Lowered with coils and spacers without aftermarket camber arms front and back.
Lowered with coils and spacers with aftermarket camber arms front and back.

Which one is better?
Is it necessary?
What difference does it make?
Which brand for the camber arms?

depends how low you want to go.
i only bought rear camber arms and my alignment was within specs.
i bought spc rear camber arms.

its better to get camber arms so you dont have to run negative camber if you dont want ti.
difference is that your tires can last longer

get coils
front and rear camber kit. Spc is good
sway bar and strut bar
rims that fit