Well, I use a Patriot 64GB EX card and the 16GB Sandisk Class 10. I know the 16GB Sandisk had issues in the past and people told me to format it and so I did.
But the thing is that there are times I don't even end up shooting and this causes the lag. 5-10 seconds for either card seems like a bit of an issue but hasn't happened for a couple days so I'll wait to see if I experience it again.
It's a good body but considering that I haven't had it the majority of the time I owned this thing, I feel Nikon kind of screwed me with a product I invested a couple thousand dollars into. (Sorry, that's just my rant; I've literally had all the possible problems that people mentioned with this thing)