A 5-way binding post just means that it will accommodate a variety of terminating ends, like banana, pin, spade, wave, and bare wire.
I would just go with 12 gauge wire all around. Monoprice and Parts Express are the go-to shops for everything you would need to build your own cables. I want a nice-looking cable as well, so I have a few places I source my parts from.
I usually get my speaker wire and cable pants from KnuKonceptz ( http://www.knukonceptz.com/index.cfm
) because they actually ENCASE the two HIGH-STRAND conductors in PVC rather than just have a jacket. The strand count is 2-3 times higher than the MonoPrice stuff. Their in-wall CL3 cables are a nice, uniform round shape PERFECT for a TechFlex wrap. TechFlex is just a flexible, expandable, nylon weave cable cover. I just buy the CL3-rated cable and cover it up with TechFlex and slip cable pants over the ends. The main thing with CL3 is you get the extra insulation whether you are running inside walls or not. Easy to cover up the ugly white cable with printing on it with TechFlex. KnuKonceptz sells the 12 gauge cable pants too but you van get that from MonoPrice or Parts Express too. I order my TechFlex from a seller ( http://stores.ebay.com/FURRYLETTERS?_trksid=p2047675.l2563
) on eBay but that can be found at the other places too. I just needed a large quantity of it and the price was right for a 500 foot roll of Carbon color. They also have way more color choices than MonoPrice or Parts Express. You can even get some that looks like a Rattlesnake. LOL
I purchase my Banana terminations from Orange County Speaker ( http://www.speakerrepair.com/
). I have their GLS Audio regular locking banana plugs but those can be hard to tighten in cramped places. They are high-quality bananas with a double screw holding system. I am currently switching to their Wave Flex plugs. The Nakamichi banana plugs and wave plugs found on eBay are highly-rated as well.
Top wire is Tributaries CL2 12/2 gauge with plain-old heat shrink on the ends. Bottom wire is KnuKonceptz 10 gauge CL3 10/2 using their 12 gauge cable pants to hold the TechFlex in place. The banana plugs are the GLS Audio locking banana plugs. Get the Wave Flex for easier connecting of cables to equipment in tight places.