I am thinking about finally adding a subwoofer to my setup.My spare room is only about 7m square so i don't need a big sub. Sony DVP-NS900V Marantz sr6200 Mission 773e fronts qed silver bi-wire Mission m5c centre qed silver bi-wire Mission m7ds rears qed silver single I have a budget of around £500 . Are these worth a look? Rel quake ,q100 ,q200 and Velodyne CHT 10. Anyone have any comments on the above? Thanks for reading.