If reliability is big, here are two experiences from my last purchase:
(1) be careful about the media card reader you select. I bought a $20, 6-in-1, taco-stand-media card reader from OfficeMax. Turns out, it didn't play well at all with the 512MB SanDisk Ultra II SD card I later bought. The first time I tried to download pictures onto my Powerbook, it chowed the volume structure on the SD card. I nearly lost an entire evening's worth of Holiday party shots. Which brings me to my second experience:
(2) if you buy a SanDisk card, they give you a URL that gives you a discount on specialized recovery software from LC Technology. It sure saved my a$$.