I completely understand, being a 40 year old that needs trunk space as well. The w6 should give you plenty of bass if powered to it's potential. For comparison, I have 2-alpine type r 12's in .85 cubes each, sealed, and with 500 watts each, they get very loud. Not Spl competition loud, but loud enough to hear from down the block if I choose, and enough to make the mirrors useless. I expect that the w6 with 400-500 watts will be more than enough for music.

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2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p963
Infinity 2.5" center channel
Alpine type R 12"(2)
all active SQL set up with 2000 watts rms