MicroSD cards for the Galaxy S3?

Hi everyone

Just recently purchased a Galaxy S3, and I was wondering if anyone knows if a 64gb MicroSd will work ok with the phone, or if there is a limit on the size of card that can be used?

Also I have switched from an iPhone 4 to the G3, and i wondered if there are any good apps for synching the phone up to a Mac?

Really enjoying the Android experience so far. It is nice to have other options, and a bit more freedom with the device.

Thanks for any help offered.