i plan on getting this photofast cr-5400 pro duo adapter and buying 2X 8gb microsdhc cards
DealExtreme: $4.27 PhotoFast CR-5400 Dual-Slot SDHC MicroSD/TF to MS Pro Duo Adapter (32GB Max)

the problem is, i don't know which microsdhc card to get, because there are so many choices. I've read that alot of people get sandisk, so i looked at these 2, what's the difference between them?
Amazon.com: SanDisk 8GB microSDHC Card CLASS 2 (SDSDQ-8192, Bulk…

Amazon.com: SanDisk 8GB MicroSD Card ( SDSDQ 008G A11M): Electronics

also will a 2X class 2 microsdhc in an adapter have slower speeds than lets say a real sony pro duo memory stick?