High Speed MicroSD Card? class2/4/6??

Yes, go for class 6 IF you need your SD card for video recording (especially HD video). Otherwise, the data transfer rate is very subjective. I recommend either class 4 or 6 for your Incredible. You can find a 4Gb class 4 Micro SDHC from NewEgg for 9.99 + 2.99 shipping. It is a lot better than the class 2 micro sdhc you can find on the Verizon website!
 
Class 6 works fine in the phone. I've not used a slower class myself. Have a couple left over from another project that were not used.

YMMV
 

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