I have an SVS PCI 25-31, Epik Legend and a Premiere Acoustic PA-150. The PA 150 is a lot of sub for the money. If I had to keep only one of the three, the PA-150 may be the winner. It has the most output of the three and sounds nice with music. No one talks much about this sub since it is not as popular as some of the major brands, but it is certainly just as good in build quality and performance in the under $500 dollar price range. At $400 dollars, I don't know of anything better.
Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus Five 200 amp, Chase SS 18.2(2), VS 18.1(2), Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500