I'm looking for a sub to replace my current idq10v1. I really like the sound of it just looking for a little more output. I have no restriction on box size but will be using a boston gt-22 to power it. Specs read 270x1 @ 4ohm and 400x1 @2 ohm all at 12.6v. other restriction is budget. I'm looking to stay below about $150, not afraid of used equipment though. What would you do?