Look for low capacitance wire that is flexible. Mogami is pretty much the standard of the recording and film industry for high quality wire. They make low capacitance wire. I use Mogami everywhere, rather than boutique. Not saying the boutique wire is snake oil. Don't know for sure. But Mogami is very high quality and trusted by the ears that are trusted by an industry where hearing acuity counts for big bucks production and profit. Also, industry buyers buy for high quality, and it's their job not to buy for value without sacrificing quality.
You can find Mogami at:
www.markertek.com
Your best source for Mogami - The Cable of the Pros. Mogami Cable offers high-quality audio/video cable for music and broadcast applications. Performance Audio has a large inventory of Mogami wire by the foot or the full spool. Performance Audio is an authorized Mogami Dealer. We work closely...
www.performanceaudio.com
www.redco.com
I have used all these vendors. They aren't Amazon fast, but they are relied on by industry pros, so quality counts.
Also,
Consider the capacitance requirements of your cartridge of choice. Try to match that. Low capacitance is best, but there is no universal ideal capacitance as far as I know. Some cartridges perform better with a specific capacitance.