Warm Interconnect....

Cardas is widely considered to be on the warm side. I would probably ONLY consider buying used with cables.

DiMarzio M-path, $160 for 1.0M pair new. From headphone.com
I use it with my Nak deck, it is almost as good and in some ways at least just as good as my Purist Audio that cost five times more when new.

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.