I currently have a pair of Tannoy Fusion (Mercury) 4 floor standers. Powered by an NAD 2200 AMP and although they do offer quite good bass, it is not amazing (Although downstairs others would beg to differ). I was thinking about getting a subwoofer for around 200 pounds-and the Tannoy TS10 caught my eye...300 Watt RMS (apparently). Is it any good and is it even worth investing in a subwoofer? The other one i was looking at due to its barrage of awards from what hi fi is the WHARFEDALE DIAMOND SW150. Any suggestions will be greatly apprectiated.