I just got a 32GB Sandisk UH-1 card (45MBs) and really like it. The transfer to Computer is very fast if you have a good card reader. The D7000 seems to run smoother than with the (half the price) Patriot.
However, the 32GB Patriot LX class 10 SDHC card seems fast enough for most use. Class 10 only has to deliver sustained 10MBs read/write speed to meet specs.