First off, put your Midnights in the closet- you have cables worth 100 on the used market sending signal from your 15,000 amp to your 15,000 speakers. What's wrong with this picture?
If you want 3038's there is a listing on a website called higher-fi http://www.higherfi.com/sales1.htm They are asking 2900 for a 10' pair of 3038's. I see he has marked them down over the past few weeks and I watch that site closely.
I purchased 3035's from them they were in "demo" condition. Not perfect - but.. good. and I was able to shave off a few (several) hundred dollars by negotiating. So... Maybe you can do the same if you must have the Kimber 3038's.
Given the capability of your system - It seems logical you would want to use the best cables possible -- but there is the chance that you could get too much of a good thing with the 3038's and need to take a step back -- in that case, get the midnights out of the closet, sell the 3038's and start hunting for a better match.
Demo if you can.
Bry