I've always been pretty sceptical about the real difference made by cable upgrades. Don't get me wrong, I still have some pretty expensive silver interconnects from my valve amp days, and use them for the music side of my kit. And I have better than basic interconnects from my tivo and freeview boxes to my preamp. But recently I upgraded these to high end kimber cables (which I was lucky to spot cheap 2nd hand) and was quite astonished by the increase in intelligibility of dialogue, and by the improved soundstage and locational definition of effects. I had no idea I was losing so much from what I considered to be compromised sources. Encouraged by this, I borrowed a nordost silver shadow digital interconnect for my Arcam DV27 to preamp. This replaced a Mark Grant cable, which is always pretty well thought of. Again the difference is striking. In particular dialogue just sounds more real, whilst musical soundtrack information is etched and well, more musical. I'm severely tempted to buy this cable, even at a eye-watering £300!! Next stop is speaker cable. I currently use Hitachi LFC OC copper, a proprietary wire which seems to punch above its' weight. I swapped in Chord Signature, but found the improvement, whilst evident, not particularly exciting. Nordost Red Dawn was next, and this was certainly different, fast, etched sound, with all the layers revealed. Perhaps a little lean, and at £1400, bloody expensive!! I'm still looking at alternatives in this area. Finally, I tried an Isotek mains conditioner, and think that this does offer a pretty good upgrade, with music and HT seeming more open and detailed, without any major downside. Possibly another purchase shortly. Certainly an area to consider for those of us with more money than sense!!