How to pick the right SD memory card

How to pick the right SD memory card | ZDNet: "The UHS-I symbol (a bold capital letter I) is for products with bus interface speeds up to 104 Megabytes per second (which is four times the existing 25 Mb/sec speed maximum) , and a new UHS Speed Class 1 symbol (a number 1 nestled inside a letter U) is for UHS-I cards and products that include a performance option to designed to support real-time video recording."