yeah, ported def. gets a lot louder. the nice thing about ported is your ability to tune it to get the most out of your sub and to satisfy your wants. sealed will always have the advantage over ported of having a much flatter response (ported/bandpass can be peaky), as well as being a bit "punchier" (keeps up with double bass kicks a bit better than ported)
---------- Post added at 06:48 PM ---------- Previous post was at 06:47 PM ----------
yeah out of the subs i listed the DD would def. be the best choice. the SSA icon would beat it SQ wise but the DD will easily get the loudest. though i am not sure they like sealed boxes if the OP is really certain on going that route