You may get away with a power mic since the cab noise is low, unless you ride with the windows down a lot. Power mics will bring in more ambient background noise from the cab. Power mics typically utilize a 9 VDC battery to supply power to the processor in the mic.
Since the Galaxy 979 doesn't offer reverb, I may suggest an RF Limited 2018 Extreme Echo mic if you can find one. Your audio will be much fuller than the stock mic as long as you don't turn all the knobs to the right. I put some paint marks at the timing controls if they get bumped or tape over the adjustment knobs once I've set them so they don't change as I handle the mic.
I tend to like hearing a
smidgen of reverb on the transmit side. Notice I did not say echo,
I despise echo. These mics can have the processor turned way down and still offer a perceived louder than non-reverb transmission with a small amount of reverb present in the AM transmit mode. I do not run any reverb processing in SSB mode (although some well known Hams do at very light and fast timing levels without issue)
Nice write up on the 2018 by CbRadioMagazine:
http://cbradiomagazine.com/Micropho...2018/RF Limited 2018 Turbo with talkback.html