+1 for the SVS SB12-NSD if you can stretch your budget to 399.
I purchased one recently for my bedroom and it's an excellent sub for the price. It's also pretty small for a 12" sub at 14" square.
Living Room: Denon X4000, XPA-5, Polk RTiA9, CSiA6, RTiA3-wides, FXiA4, OWM3, SVS PC12+, 4 Shakers, Epson 5030, VApex 92”, Sony XBR9 52”, PS3, Xbox 360, Darbee, Harmony 1.
Bedroom: Denon X2000, Polk: RTiA3, CSiA4, RTiA1, SVS SB12-NSD, Sony XBR-55X850B, Sony BPD-S590, Xbox 360, RPi2-RasPlex, Darbee, Harmony 510.
Home Office: Onkyo 707, Polk: LSiM 703, LSiM 704, Monitor 70, Yamaha SW315 x 2, Turntable, Triple Monitors, Harmony 610.