Guys, I need your suggestions...

I'm planning to upgrade my sound system sa Pajero JDM namin. Currently, ang setup niya is a Pioneer 5050UB, Sony 2-way coax sa harap, then 6x9 3-way coax sa likod. I want to achieve a hybrid SQL/SPL sound setup, but leaning towards SQL, say 60/40, in favor sa SQL.

Yun HU ko, isasalpak ko sa Pajero FM namin kasi Jurassic na yun HU nun. Tapos yun from coax ko naman eh ilalagay ko sa FX namin dahil sira na ang speakers nun. I will only retain the 6x9's. Ano ba magandang components para sa gusto kong ma-achieve? I plan on investing on good amps, say price will be around 10k-13k. Medyo cramped ang space ko pala, so I plan a sealed box para sa subs

Seps - ?
Subs - ?
Amp - ?
Sound deadening material - ?

Thanks in advance!