You heard wrong on the sealed part. Sundown's SA series is a really good line of subs that are WELL underrated. Me personally, I'd run 2 SA-12's in a box tuned to around 32hz and get something like an Audiopipe 1800 if you want to stay on the cheap side.

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Mods: Xcal 2, K&N Drop-In, Line-X, DSG Heads/Corners, 6000k Hi/Low HID's, 6K HID Fogs, Foglight Mod, Throttle Cable Mod, 6.5" Digital Designs, Rockford P400.4, 2 Sundown SA-15's, MB Quart DSC 2000.1d, Cranked T-Bars, 285/75/R16 Nitto Terra Grapplers