Guys need help

ano ba magandang audio setup for an e36 model? yung nasa 40K price range. hindi rin kasi ako sure about the compatibility issues eh so i'm open for all sensible suggestions here is my plan sana:

HU: JVC KD-DV6105 DVD (gusto ko sana yung pioneer deh-7750 pero mas upgrade-proof yung jvc ) not sure din kung pwede pa ako magdagdag ng 1 din for a motorized lcd.

separates: kicker rs5 (not sure kung magkano and where to buy)

subwoofer: kicker solobaric L7 12"

amplifier/s: no idea basta mura pero malakas

also, 2 lang ang lagayan ng speaker sa likod (5.25") tapos 2 sa harap pang 2" lang ata kasya... is it worth it kung magbubutas ako sa mga pinto para pwede maglagay pa ng tig 6.5"s?

thanks!