Its been suggested that I go for REL Q150E sub with my B&W in-wall speakers and a NAD DVD & AMP. (reason behind this sub is because the in-walls won't be able to handle much bass - and the REL will be need to compensate). However another store suggested that I go for Cambridge Audio DVD and AMP and a Tannoy R15 sub with my B&W in-wall speakers if I want to cut costs - and that that should be more than sufficient for a 14*12 foot cellar. The REL does sound good, not yet heard the Tannoy - is it any good, and can I get anything nearly as good as the REL for less cash? (Looking to spend £300-400 MAX.