I have been using a Samsung 64GB SDXC MicroUSB card in my RetroPie build with no issues. Its even on sale right now at Amazon:
If you plan on using the 2.3 image, dont worry about formating the microsd. Just write the image to the microsd card using win32 disk imager and expand the root file system to use the full size once the image is deployed using sudo raspi-config.
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