I believe you have one of the fastest SD cards out there now unfortunately. You are right, the CF cards are faster. That is why they are preferred by professionals and used in the "pro" bodies. Not many people have had the opportunity to test the D7000 yet, but I would doubt that this card would limit the capabilities of the camera. I believe you may see a slight improvement in speed though when transferring files to your computer over the class 6 cards. I have a bunch of the Sandisk Extreme III’s. I haven’t had any problems with them and the brand is generally recommended here. I did just recently see an article on new technologies in SD cards with speeds comparable to the current batch of CF cards, but by then, the CF technology will have its own improvements!