yung shop niya sa araneta car accessories.
the only way para malaman kung may line out yung HU is to remove it and look at the back kung may butas for the ampli. usually kasi wires lang run sa likod ng stock HU kaya marami nagpapalit muna bago set up.
the speakers will depend on the size of the compartment of the speakers. kung 4" talaga then its 4".
una is the seps and amp. kung all targa setup alam ko may package na 10k kay jeff. mas ok na all in one go kasi kung seps muna, walang bayo, kung subs naman una walang mid and high.
the brand will depend on the budget. for me, ok pa rin lanzar spes. mura na, may bubuga pa.

pero sabi naman ng iba, bang for buck talaga yung targa, less than 1k ata meron sila seps, not that sure lang. another brand na ok, ryan audio. try to audition first kung ano trip mo sa ibat ibang brand.