You have a similar setup to one of mine in terms of the electronics. I have wired the speakers with 12 gauge cable, with gold plated connectors.
This is a very subjective issue, with varying opinions and points. In my opinion based on testing, listening and measuring, it is beneficial to have a good sized cable. This will not impede or restrict the output. You can find this cable at Home Depot, etc. If you want a low cost brand name, Monster is popular. There are numerous brands at all price points. You should also have good quality interconnects (between amp and CD).
Your system is well balanced, and I would not limit the potential by using bargain basement, or "throw in" cables and connectors.
Do not concern yourself with Biwiring, or Biamping. These can be explained if requested, but you are not in need of installing this.