A 16GB class 10 SD card for real little money - the thing is, as expected, quickly and for my application, the Raspberry Pi, perfectly suitable. Had two of these cards I ordered two Raspberrys ordered to also - as is the other now come until the second card has found its use in my EinbauNavi where she performed as wonderful services.
Have therefore to buy not only before but again a buy two more directly - for the price and performance at all times!