Noobie Question on speaker cable for my system

I have a HK AVR230 65watt receiver that will run 50 x 5 in a home theater set up. It is rated at 8ohms. My Ohm Micro Walsh speakers are 6ohm 20-150 watt fronts and center. I will be adding the rears in a couple of months.
Not sure if this is relevant but the speakers frequency response is 47-20,000 Hz +/- 3.5 dB for towers; 80-20,000 Hz +/- 3.5 dB for center.
I am considering Audioquest type 2 or 4 or something else in that price range. With the additional strain on the amplifier, is there a minimum wire gauge I should start at for speaker cable? Is it even something I should worry about?
I will be bringing this up with John at Ohm Speakers but wanted to hear this forums opinion.