Cuchulainn, which sony bravia? There are several in the line up, the first one being markedly inferferior to the rest. As regards the response time, have you checked to see how it's measured - there are several e.g. the time it takes a pixel to change the full spectrum of colours grey-to-grey or blur-edge-width etc. These numbers mean different things and are put out by manufacturers as part of the marketing of the product, not necessarily as indicators of the quality of their tv.
Besides, response time is probably not the most significant issue in evaluating a tv. A crt telly has a "response time" of 0.1ms (compared with the 8ms in the current generation of lcd panels) but if I'm watching bbc2 via ntl cable, all I can see is a hazy, blurry, badly focused picture. The reponse time is not the factor here, but how the tv resolves and displays the signal. Other significant factors in how the tv does it's job are the tuner, processing software, ability of the panel to represent colours, blacks etc.
Again just my 2c.