I just got my D7i and was also debating on the right CF card. I did some reasearch and the Ritec, Ridata and the Transcend perform about the same. I bought the Transcend and it works great. It only takes around 10 seconds to write a Raw file to the card. I think any of the above cards are the best I could find and believe they are the best for the D7i. And believe there is a difference in speed between cards. The card that came with the card took 30 seconds to write the same file. It is also is faster when writing Jpegs to the card. This is helpful when shooting several shots in succession. I believe the compact flash controllers on the above three cards are what make the difference.
Enjoy the D7i its Great!!
Dave
