The 1017 doesn't do audio over HDMI if you're looking for that feature. If you had a PS3, you would be missing out on the new formats which the PS3 can decode and send out as LPCM. As far as I know the 576 does accept LPCM over HDMI. Demo both, preferably with a familiar movie and ideally the same speakers as yours and see which one you prefer. The 1017 would arguably have the better components etc. as it was a £500+ amp when it was new but in the end, decide with your own ears, particularly as the 576 is brand new and most folks won't have seen/heard one.