recommends for interconnects?

@goofyfoot "...I purchased some Cullen Crossover interconnects to compare with Audioquest Colorado RCA’s. I wanted to determine whether I liked silver or copper from the tape outs on my power amp to the inputs on my headphone amp. "

I would say this experiment is to see if you like Cullen Crossovers versus Audioquest Colorado interconnects for... as opposed to copper vs silver. Way too many variables between these interconnects to be just comparing the metal used in them. There are the dielectrics, geometries and terminations. Good comparison... but mostly just between two different interconnects which may or may not reflect the metal use. 

The go to cable for the best sounding rooms at every audio show https://triodewirelabs.com/

Audio Sensibility is an excellent choice also. DH Labs not so much.

In my system the absolute best is https://www.puristaudiodesign.com

There are several threads here on AG about veritas cables - check them out.

a lot of positive feedback 

all the best in your journey 

"Retail is around 1500 but if you look around rarely you can find a pair in the $800-$900 range on the used market."

When the OP specifically states that he is looking for XLR cable recommendations "under a few hundred dollars", how is this useful information? 

In my opinion cables do make objective difference. I have tried many over the past 30 years listening to good and great music. I have a pair of Magnapan 1.7ix. I was told about AntiCables years ago. I am now using the 7.3 level (Dual Conductors-silver/gold). But i use the RCA interconnects. They have the same in the 5.3 level XLR. To me they are a good match with the Magnapan and not that expensive.  Best of luck.