fwiw -
I have had good success with these:
Transcend Information 32GB Micro Card with Adapter (TS32GUSDHC10V)
This specific model is intended for high write cycle use - the raspberry shake community uses them and is a good testament to their durability.
The manufacturer's similar product with silver paint is intended for temperature extremes and is not the same as the gold paint model (link shown above).
vy 73 Jason N1SU