I and lots of others disagree heartily with Mrtennis's characterisation of silver-conductor cable (SCC). While the sound of SCC is as variable as many cables made of copper conductors, in fact, other factors being equal, silver is a slightly superior conductor and cable made from it will sound cleaner and less characterful* than copper-made cable. In the 2 careful (and exhausting for me, as I'm no GEA and I have to WORK to hear subtle differences) comparisons of IC I've done, SCC has sounded cleaner, more transparent, than copper-conductor cable. I have solid-SCC throughout my system; my system does NOT sound timbrally inaccurate, instruments do NOT sound unreal, bad recordings do NOT sound worse (they simply sound the way they sound), and the sound of my system is not at all annoying. In fact the sound of my all-silver-cabled system continues to improve, and it's the best-sounding system I've ever had. (I'll not comment on Mrtennis's use of the term 'analytical', as I have no idea what that means.)
PS Audio is now selling its new Xtreme Resolution ICs. The 2 cables are apparently identical except that Reference is made with VERY-high-quality copper and Transcendant with silver conductors; see http://www.psaudio.com/products/xstream_resolution_audio_overview.asp . Read what JerryS of 10Audio.com has to say about them here http://www.10audio.com/psaud_ref_trans.htm .
Personally, I don't choose IC or speaker cable on how it 'sounds', so I don't look for a 'warm' or any-other-sounding cable. My goal is cable that has no sound...no character...of its own. If your system sounds a little thin, I suggest you replace or retune whatever components are creating that lack of richness. In my experience, it's almost always the speakers and/or room.
* and, after all, most of us want our cable to have NO character whatever.