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What kind of depth do you have to work with? The BC 8NDl51-8 might interest you. They are 8 ohm but have a very high efficiency. Check them out BCSpeaker
Hmm, interesting woofers coming by . Does price matter ?
How about this one http://www.visaton.com/en/car_hifi/tiefton/gf200_2x4.html . Very SQ en don`t need that much juice .
i'll second my vote for the Dayton reference... you should really consider it.
otherwise, you may want to take a look at some of the 7's tested here:
http://www.zaphaudio.com/6.5test/