i would suggest to go for the following
woofer pioneer d4 in a proper tuned enclosure made with 1 inch mdf lassani wood lined with polyfill
for speakers go for pioneer v2 they have excellent vocals
amp get a USED SOUND MAGUS vs1500.1 and a used 2 channel chinese amp for the speakers
for pre get a new pioneer 5250 sd
get an additional battery to support the amps
wiring use local one
costs:
woofer will cost 4750
the box made with 1 inch mdf lasani and lined with pollyfill will cost around 4000
the speakers will cost 11 thousand
used sound magus vs1500.1 will cost around 12 thousand depending upon condition the chinese amp will cost around 4 to 5 thousand
pre will cost 10500
battery will cost around 5000
wiring will cost 1500 to 2000
the rest rear board for speakers 400
and labour will cost 600
total cost : 57250