I have the VX-11 and it sounds great to me. Not too bad for a budget sub. Sometimes Fry's will have them on sale for around $150. Haven't heard the other two you mentioned, so you may want to go and listen to all three in person to see which sounds best to your ears.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!