Whole Lotta Cardin' Goin' On
Good questions - if you are in a speed race with the next camera club member and need to gain bragging rights by inching ahead in the Megabyte-Per-Second Stakes you can either use a whip on your rival or get a Hoodman Raw Steel Ultra High Speed SDHC card. Then you can fight it out amongst yourselves.
If you don't need quite the blistering speed but would like an SDXC card that will go at 60 MB/second and carries a lifetime warranty, may we suggest the new Hoodman High Speed SDXC cards that have just come into the shop. They are in 8, 16, 32, and 64 GB sizes and the prices are about a third of the Ultra High Speed version.
Now, my camera system still regards this speed as blazingly fast, so I get to benefit from the price advantage - you can too.