I love my 13.5 JLW7, I use a JL1000/1 on it. I have it tuned for my listening taste which is fusion / rock / jam band stuff.
I did have an Adire Audio Brahma 12" before the JL and it was also very good for SQ, and it was not expensive for a good sub.
Hope this helps,
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2002 Slap National SQ Champion Pro Street 601+
2003 Slap National SQ Champion Pro Street 601+
2004 Slap Expert Class 5th Place
2005 Slap Expert Class 2nd Place
Alpine CVA-1004, Alpine CHA-S624, Alpine NVAN751, Alpine PRA-H400, Adire Audio Koda midbass, Dynaudio MD-100 Tweeters, Audio Control DQS, JL Audio JL1000/1, JL300/4, JL 13W7