Have Box...What sub?

[Dynasty 10+ year member]

I have a custom ported enclosure (2 cubes @ 34 hz) based of Moe's plans. I had a single 12" Kicker CVR powered by a Profile AP1000M and it got pretty loud for me. I sold the amp and have been with a sub stage for a few months. But now I want it back. With the current box I have what sub will get louder than my previous set up? I'm going for 80% SPL and 20% SQ. I would like to stay under $150 and has to be a single 12". I also need an amp, but that will be based off the sub suggestions.

Box- http://img34.imageshack.us/my.php?image=2cubes34hz36sqin7fh.png

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[skylineTT 10+ year member]

CVX would be nice. throw 1000 watts at it and it will be great. ive seen them go for 120-150.