There's a ton of responses to this exact question over the past several months. Suggest you search on it - you'll find what you need. For people on a budget you will generally find support for Hsu, ACI, cheaper RELs and Velodynes among others.
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I second the sealed sub suggestion. Hsu Research will be fine for any application -- it's a matter of setup. I'd also suggest M&K; their push-pull driver configuration is said to cancel 2nd harmonic distortion. Don't forget the bass management controller.