Best sized car subwoofers (for metal)

turns out my parents are goign to spring for the initial replacement of the stock stereo (birthday present) and I'll be able to waste a little bit more dough on JUST the subs.

What brands should I look into? I was thinking JL audio, Kicker, and maybe Rockford Fosgate. I listed to different sizes but they were all Kicker Subs..the store here didn't have much else. I think a 1 x 12 sealed enclosure would be the best. It hits pretty hard (solo-baric) and it would leave me a little bit more trunkspace than having 2 x 10 or 2 x 8. And I don't need 2 x12 at all.