Well do you know the dimensions of the room you're trying to use the subwoofer in?
Hip Hop thread Part 1 (No Longer Updated): https://www.mpgh.net/forum/316-music-...-hop-list.html
Part 2 (No Longer Updated): https://www.mpgh.net/forum/2-general/...ad-pt-2-a.html
Part 3: COMING SOON
You have to worry about being able to pressurize the room, try getting at least a 10 inch with decent RMS wattage, bigger cone size means the driver will have an easier time pressurizing the room, so in this case if all you want is bass and not as much sound quality the biggest sub you can get in your price range will probably work the best, especially if its a ported enclosure with plenty of RMS wattage.
Hip Hop thread Part 1 (No Longer Updated): https://www.mpgh.net/forum/316-music-...-hop-list.html
Part 2 (No Longer Updated): https://www.mpgh.net/forum/2-general/...ad-pt-2-a.html
Part 3: COMING SOON