You may want to order an 8gb in case the 16gb doesn't work. Quote from the guy who made the Raspberry Pi;
eben
on March 3, 2012 at 1:08 am said:
We don’t currently work with some high-capacity class 10 SD cards. There are plenty of 8GB cards that work well, but I’ve not seen many 16GB cards that do. We’re working to develop a fix for this.

