DH Labs has a "Z Plug" Banana that is affordably priced compared to Nordost and others. I have the silver version, and they are very easy to use DIY. Their Odyssey 14 awg cable would also be good choice for long-run rear channels. I think it is made in USA as well.
Cables for rear surrounds
I've got about a 50' distance to get my surrounds wired up from my receiver. Thinking of using 16 gauge pure copper insulated wire with banana plugs. Should I cut any excess lengths which may be about 10' or so. Or does it really matter?? Any tips other than the obvious in wiring for surrounds?