Ignore the cynics out there perrydave.
I have just upgraded from a 10 year old Sony str-db930 which has done me well all that time. In fact I am selling my mint old amp still with original box and was hoping to get about £50 for it. For that money it is a bargain. The 930 cost me £500 and was a well respected What Hi-fi 5-star receiver at the time. Build quality is top notch (put's many current amps to shame) and sound quality isn't too shabby either.
I think the 830 spec is pretty similar to the 930, so although no HDMI (of course) you get 3 optical inputs, all able to decode DTS and Dolby digital as well as a half decent prologic II for stereo inputs which are all still relevant. Due to the lack of multichannel outs on your sony blu-ray you will be limited to SD-surround audio over optical, but it will still be perfectly adequate until you are ready to spend considerably more. I would say at least £300 to get any significant audible improvement. Do stick to the optical inputs for best sound quality though.
Stylewise, the Sony QS is tasteful and has aged very well - probably due to its minimalist design.
Shame about the surround problem, but I think it will be very hard for you to be disapointed.
Good for you