What is your budget? Silver ICs can have a number of different sonic signatures depending on the design. Same with copper and gold, or even those designs that are hybrid.
If you truly are looking for a warm IC try VH Audio Pulsar cables, they are very reasonably priced and have a 60 day trial period. If your budget allows you to go higher, perhaps Xtreme Cables or Oritek might be your ticket. You should also keep in mind that cables are also system dependent. A pair that sounds warm in one may not sound warm in another.
If you truly are looking for a warm IC try VH Audio Pulsar cables, they are very reasonably priced and have a 60 day trial period. If your budget allows you to go higher, perhaps Xtreme Cables or Oritek might be your ticket. You should also keep in mind that cables are also system dependent. A pair that sounds warm in one may not sound warm in another.