I have no experience with the 800x Lexar but I went with the 32Gb 1000x CF and the 32Gb 600x SD for my 800E and figured I would not be bothered with the questions whether I should have gone for the faster card or not. For my situation the price difference wasn't a deal breaker. Also the configuration I went with was Raw to the CF and Jpeg to the SD card. I've been very happy with it so far.
Tom D800E, D3, D200, D70, F6, F3/T, F2AS, FM2N
We all come into this world with our little egos equipped with individual horns. If we don't blow them, who else will? George Sanders as Addison DeWitt in "All About Eve"