well... actually nothing much you can gain except that the internal space for apps and cache have been increased with larger capacity...
i myself use the 8gb class 10 microsdhc for now (which currently i have 6gb plus of extra DATA capacity)... if you want to use 16gb or even 32gb, you can but the problem is, how to utilized the extra space gain...
and you might need to use the modified boot.img so that streak would recognized the extra capacity... 8gb and below is recognized by default... therefore, i would stick with the 8gb...
many of your future question usually have been answered many times, so please do a search bout it... thanks
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