Well this new MicroSD looks amazing, it's currently on Amazon for $37.24 USD so I think it lands for around $43 ish AUD.
http://www.amazon.com/Samsung-Electronics-Adapter-MB-MG32DA-…
It's fast but is it overkill for a mobile phone (Galaxy Note 3 n9005)
I've had bad experiences in the past with slower/cheaper MicroSD's causing lag so I just want the best within a reasonable price range.
The 64GB version isn't available yet, it also states only 50MB/s write on the 64GB version, I suspect this is a typo copied over from the 16GB variant though.
Personally I would just get the fastest card within the budget.
Even if the phone can't make the most of the speed, you can appreciate the difference if you plug the mSD card into a computer via an adapter. Those extra MB/s makes a tangible difference when you need to transfer several gigs of data at a time, e.g. movies or videos