MicroSD Card for the S2 - Which one are you using?

I am looking to purchase a MicroSD card for my S2 I want to purchase one that is know to work and you can personally vouch for it in your S2

I have read that certain formats will not work with large (128GB) MicroSD cards. So help me out if you would and let me know what works and what doesn't. I would like at least a 64GB or possibly a 128GB.

Thanks