I use Transcend 16 Gig cards, they're cheap and so far I've had zero issue. You can find them fairly cheap, the 133x cards I have were around $35 each, and I bought them on eBay. I also recently bought two Maxell 16 Gig 400x cards, $20 each from B&H, they get good reviews, and so far they've worked perfectly. Had Several SanDisk cards, a few failed, a few still work great. I'm sure it's up and down, some people are gonna get great results from a card made by Joe Schmoe, some people swear by SanDisk.
Me, I use what works, and so far Transcend and Maxell have worked great.