Would a expensive brand cable make a difference if it's a two channel set up ? I have the same set up as @umangloria.What makes sense or not is for the OP to decide, he has a decent setup and budget to start with and going by his first post he'll be adding to it as and how his budget allows beyond whats mentioned. HT speaker cables unlike 2-channel stereo cables are a pain to keep on installing and uninstalling, so if one is going to spread the web then why not with better options and no be bothered in the future about it when upgrading to better speakers or amps.
Is there any significant in terms of audio output b/w 14 and 16awg ?