I really only have one more room to build a sub for and it doesn't have to be pretty by any stretch of the means, it'll just be a game room in the basement basically for background music.... I don't like other forms of subs - its sealed for me and nothing else will do it in terms of accuracy or the nature of its SQ over other designs...
I have said this many times before but, personally I do not care to have a port contributing in any way to the sound signature presented, I prefer a driver system that retains its air spring/driver loading. I also lean towards a manageable, heavily braced cabinet size, where the rear wave is isolated from the front wave. For my bass reproduction I'd rather not hear the subwoofer, just the sound.