a workmate is upgrading his 'system' and is offering to sell his old sony 925 surround amp to me for £170. i was wondering if this was a good price, also what exactly are the features of the amp, has anyone owned one and if so how was it, is it the model before the 930 as my m8 has one and it seems quite good. i have a wharfdale 750dvd and a 32" toshiba flatscreen pro logic tv. would upgrading to a dd/dts amp in a 4.25*3.75m room be worth it? cheers for any help.