Have Sony TV (4:3 format KV), Sony NS400D DVD player and am now considering buying AV amp/receiver. Should I stick with Sony? Have my eye on STR-DE475 which seems reasonable spec for my budget (£300 inc speakers). Should I also go for Sony speakers? (HTK-475 comprises STR-DE475 and SAVE-225 Pascal (?) speakers). Is there anywhere in or around Northampton that I can get good impartial advice?