Wow! You are getting the scatter gun approach with these answers. As someone who has been hooking up speakers for nearly 40 years in everything from cars to stadiums I think I have some experience as well as the education from a highly regarded college.
For the JBL speakers, lamp cord will work fine. 16 gauge, multi strand copper. If you have really long runs, go for 14 gauge. You can get this at Home Depot, Lowes or any hardware store. There is a slight difference between this and high priced speaker wire that you might hear if you have ultra high end speakers and ultra high end power amps and pre-amps. You aren't going to hear the difference with your setup or 99% of all the audio systems currently in use in the average home. You can even buy extension cords and cut the ends off. DO NOT use Cat 5 wire. It has resistance problems, capacitance problems and as it is a solid conductor, it will suffer from "skin effect." Your subwoofer will need a simple male to male RCA patch cord. Radio shack makes some nice ones with heavy insulation and stress points built to last. You can get cheap ones at the discount stores. Personally I stay away from the really cheap ones as they crap out after a few years and become intermittent. Again, expensive "audiophile" cords are unnecessary for 99% of the time.
You can stop reading here if you don't want to know about the fine details of speaker wire. Never use solid wire such as Romex, communication wire such as Cat 5 or "hook up wire." It has "skin effect" which is caused by the tendency of electricity to flow over the outside of the conductor which in turn causes distortion that is most noticeable in the higher frequencies. Actual speaker wire is constructed so that the strands of the two conductors weave in and out reducing their surface area. That's one reason why it is expensive. However, the same thing happens, probably to a lesser extent, when regular multi strand wire is made for use as lamp cord or other applications. Strip a foot long section and you'll see that the strands are anything but straight and parallel. The purity of the copper is pretty much consistent in electrical wire. It's up over 99%. Impurities cause higher resistance and higher resistance causes heat. The manufacturers don't want to get sued for burning down buildings and roasting people. The electrical codes also enforce purity standards. Copper that is less pure gets sold for use in plumbing pipes. As far as I can tell "oxygen free" wire only provides the benefit of preventing the conductor from oxidizing and turning green after a substantial period of time. However I have seen oxygen free wire do just this despite the claims. The gauge of the wire is important in regards to length and power. There are tables that will allow you to calculate the proper gauge to use: