+2 SVS footers - $50 a set, use them, nothing but good things to say about them.
I would take with a grain of salt the poster who recommends the Townshend product. He would have you spend as much on the subwoofer platform as the subwoofer itself.
You will note he owns and repeatedly recommends all the Townshend products and likely has an undisclosed financial interest now or building for the future in products sold on his recommendation.
Anyone feel free to chime in with any corrections.