OK, an unbiased opinion from someone who doesn't sell anything.
IMHO IC's and speaker wire should be neutral and allow the electronic's signal to pass undistorted. A question for you to answer to yourself. How do you 'know' the cables in your system are responsible for your systems shortcomings?
You are asking for warmth - which suggests to me that your present system is too cool for you and that you want to bend some part of the frequency response which (for you) embodies the warmth spectrum. IMHO if your cable adds sense of warmth it does so at the expense of other frequencies, like the upper mids and highs which will seem to be rolled.
You want cable which will provide for the impression of expansion of soundstage and air between the instruments. Often when this is achieved it is done by emphasizing the upper mids and highs and concurrently reduces the sense of warmth inherrent in your electronics.
You've got a bunch of individually good components. But, if you find the sound wanting seriously in the areas you outline, I'd be looking at component synergy, not wire. Now if you are talking about typically nominal acoustic differences I'd be trying to find the most neutral cables available and I wouldn't buy anything until I heard it in my system.
FWIW.
