I A/B'd monoprice's premium RCA cables against a set of Monster M850i's...and did not notice any significant difference. If you're wanting something with a warranty, Blue Jeans or Cobalt both make excellent quality cabling, and I think both have locking RCA terminations?

Lots of companies make good quality 12- and 14-gauge speaker wire, but I tend to go with the ones that are inside a single jacket for ease of feeding and handling. Personal preference. Bare wire is as good as any other connection, but bananas are typically easier to insert/remove in tight areas. In any event I usually spray cut speaker wire w/contact cleaner, as it's the most likely area to corrode over time.