Building on the earlier suggestion, I remember when I first got into the G series and made the mistake of overspending on the fastest media possible. Honestly, you dont need to drop that much cash. The G7 hardware is limited to UHS-I speeds anyway, so those V90 cards are kind of a waste of potential in that specific body. I have been really happy with the Kingston Canvas Go! Plus 128GB SDXC UHS-I V30 for a long time now. Its been super reliable for me even during long 4K video sessions in the summer heat. No complaints at all. I also carry a Lexar Professional 1066x 128GB SDXC UHS-I V30 as a backup and its performed flawlessly through hundreds of cycles. Both cards handle the 100Mbps 4K bitrate of the G7 without any buffer issues or dropped frames. Basically, save your money for a nice prime lens instead... these mid-range cards are more than enough for what the G7 can actually output. Just my two cents after years of shooting with this kit.

The best choice is to get a UHS-II V90 SD card, such as SanDisk Extreme Pro UHS-II V90 SD card.