If you're not into full scale bass-attack type of ICE, I'll suggest you purchase a new 5-Channel amp say for between $1,300 to $1,500, a good 6.5"/tweeter component for the front & also a entry-level 2-way 6.5" at the rear for passenger staging during movies when you install your DVD. Well tune setup like this will re-create good sound music & DVD playback. Not necessary to go for costly speakers above $1K for the front.

Most 5-Channel amps are rated between 120w to 200w X 1 @ 4ohm for its sub output & recommended for a single enclosure 12" or possibly double voice-coil 10" the most depending on ownner preference ICE-Setup.

Have already indicated that high possibility of installing DVD Screen-Player in front; propose for 2-way setup with 'rear-cover' speaker installation using good 'cap-ayam' 6" 2-way speaker as depending on model of DVD screen-player to be install for possible discrete 5.1 or a 'reverb-delay' surround-sound.

Like I've mentioned in many earlier thread, have to check the amp guts closely; there are power transistors within to check ratings & the nos it has which indicate its actual capacity immaterial whatever is printed on the cover.