I haven't heard any bad things about PNY, only good, and that is a pretty good price for a 2 pack of 1GB cards. I do wonder if these are high speed cards though. If not, you will experience lag between taking the last photo and being ready to take a new one. I'd stick with the Lexar high speed if this is critical for you. If not, by all means go for it.
Home: 2006.5 iMac 20"
Me: 2010 MacBook Pro 13", iPad Mini Wifi 32GB Black, iPhone 4 16GB Black
Wife: 2011 MacBook Air 11.6", iPhone 4 16GB White
Are you backed up??? If so, why? Psyllium Fibre is not free but will do wonders!