Warm Interconnect....

Cardas Neutral Reference would be good choice for your budget, used.

Nordost Heimdal. Not at all cold. Good dynamics and detail, with some sweetness in the mix. 1/2 price now at Music Direct I think. I have two pair myself and been using them for a couple years.

I've borrowed or owned about half a dozen IC's and out of those the Harmonic Technology Truthlinks (I own two pair) are clearly the most full bodied and warm and still had extended highs. That's not a huge sampling of what's available out there but might be of some help if the Truthlinks were on your list.

For your budget I suggest Auricle Audio Encore! Kaptons.
http://auricleaudiodesign.web.officelive.com/product.aspx

the quest for a warm cable has appeared on other threads.

the problem with achieving warmth, detail and treble extension is that the very nature of warmth denotes treble attenuation and and a slight peak in the lower frequencies. since warmth is a coloration , its presence will affec resolution. so, if you want warmth, you will get a reduction in clarity and treble response (spl).