Looking for advice on good cat 6 RJ 45 cables. I find 50 ft of unshielded cable for $6 something and 50 ft of cable that does not say it is shielded for $20. Prices vary for the 100 foot lengths as well. Have seen 5 mil gold plating on connectors advertised on some cables. Would prefer a shielded cable. What else do I need to look for besides the cable meeting the cat 6 standards?