im guessing youre on a budget.... i think most people would recommend saving up at least 200 for a decent sub. i doubt too many people would recommend one of the subs you mentioned if they had heard quality subs in action.
well... if you hadnt heard dvd audio youd think cd audio was the best and there were probably people that thought cassettes were awesome too in their day. what im saying is that you should go out and see the products you are asking about and compare them to stuff that costs more like velodyne, etc and i think you would not want the sharper image.