$80 for a 16 gig SDHC card isn't a smoking deal. $40 for a 16 gig class 6 card isn't horrid, but I would prefer to stick with major brands when possible - I have heard of Dane, but don't know anyone who uses them!
I paid on average about $30 for 16 gig SDHC cards by Toshiba. Of course, those are class 4. But, I never had a problem with them in my D90.