Yeah they are both good companies, but Newegg is super reliable and always fast.
Here is a link with the 4giggers, the cheapest are all about $30 shipped.
The A-Data one is a class 6 and may be faster than the Kingston which are class 4, I actually have the A-Data and it's pretty fast. Read the reviews they all say the same about it.
http://www.newegg.com/Product/Produc...name=MicroSDHC