Is there a better sub than the Aerial SW12?

I use a stereo pair of Vandersteen 2Wqs. They use a downward firing, slot loaded set-up in a sealed cabinet, crossed over at 80 Hz. They are very reasonable--you can easily get two for the price (or less) of one these supersubs. The design avoids or minimizes many room and blending problems and uses phase coherent, passive crossovers, either XLR or RCA.
Good luck,
Jeffrey