Speaker Cable Recommendations - Under 2k

Since your system is centered around litz type cable, most any cable should move the tonal response of your system toward the mid or the lows as the small gauge of the litz wire provide a more linear resistance than a larger gauge conductor witch provide more emphasis on the lower end. Hi you select a cable made of conductor of large diameter (16 to 12 gauge of individual conductor)  you may find that the highs are missing.

Also as the litz wire have a lot of dielectric material (as all the small wires are individually insulated) any cable upgrade with a cable having an air dielectric will provide more details and a faster sound with more impact.

A used pair of Audience AU24SX can be had within your budget. Great cables.  

That's exactly what I am using, and I have no "grass is greener" urges. I also bought them used.

Kimber Speaker cables

I bought a used pair of Audience AU24 SX that are only about a foot long for a headphone setup. I was very impressed by them. So much so that for my Livingroom speaker setup I am thinking of saving the cash and get the AU24 SX over the Audience FrontRow. 

I have Audience FrontRow on my office speaker setup, and I love them but the AU24 SX is also very good. Maybe not as clear as the FrontRow, but that is really nitpicking, and the price difference is rather large.