Magkano budget? and ano ba gusto mong maging overall setup ng oto? would you upgrade subs in the future? kasi sayang lng pera bro if 2-3 mos mag u-upgrade ka din, try deciding what you really like (SQ, Loud and Clear, SPL etc.) then you can start from there, if SQ I suggest invest muna sa magandang Speakers, preferably seps, not coax (integreated 2-way, 3-way), if gusto mo lng tlga may konting bump from bass I guess NBN would do, or ipon pa konti and get a 8" or 10" subs, seal mo nalng, a V12 4-channel amp, channel 1 & 2 can drive all of your seps, 3 & 4 bridge mo for the subs.
SQ lang poh talaga, meron na poh kc akong nakaSPL na auto kya gusto ko lang poh talaga mgkaBump lang konti ung bass. Di poh kasi pede lagyan ng pangSPL ung advie kasi gamit na gamit po ung backseat ng advie ko