8's are nice for a daily driver. Way back in the late 80's, I had a system in my stang with 4-8" MTX blue thunders powered with just 400 watts (remember back then a powerful sub could take 300 watts). It was one of my favourite systems for everyday listening, very tight, clean bass with very little ultra low bass. I remember listening to a lot of Rush and prog rock back then, Lakside park, closer to the heart, and limelight played really nice! If you're really into your rock, then you can't go wrong with a set up like that. I suggest 4 of them though, as Westec said...spl, 2 just isn't loud enough.

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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