In the $500 - $600 category I would go with either the Adire Audio Rava (primary music), HSU VTF-2 (50/50 split between music and HT), or SVS (mostly HT) PB1-ISD or 25-31PCi. If you have something other than your primary receiver to power it with you may consider the VMPS New Original Subwoofer or SVS 20-39CS+.