For $369, that SVS is unpowered, meaning it does not come with an amp. If it will not accept speaker level input, then it is useless to you. By running speaker level (R&L) output from your receiver to the sub, the sub runs off the receiver's amp. Not a great way to go, as your receiver has to...
The advantage of the Velodynes is the active circuitry. Yamaha subs also employ this technique (and a few others). It works quite well.
Yamaha YST-SW320 is a good deal. Active Servo/200W/20Hz for under $300.
Slam for the buck, I'd say Sony SA-WM40 is your best bet.
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