I would definitely try DHLabs. In that price range they are excellent.
I would not confine yourself to a single parameter (overall material comp). Really cheap ones tend to sound like their material… but well thought out, high quality ones will get their sound from overall construction… not just the conductor.
Also you might try the cable company. Lending library, and used go at 1/2 price. I would look to spend the most wisely. Sticking with a lower budget my simply buy little improvement. You want to feel whatever you get, easily justifies the cost. Your system is an active variable in what sounds best.