I have a Targus I bought at Walmart. Works good no problems and it cost me $9.88. I have a Sandisk, but never use it. That one cost me more but it is cumbersome to use, the Targus is like a flash drive, the Sandisk, has a cord. I like the Targus because it's been working for two years, and I just insert the SDHC Class 10 card into it, then plug the reader into the USB port.
I don't like using the USB cable that came with my K-x because depending on how many photos I have to retrieve, it can and does drain the batteries.