It can take a 32Gb (I have tested) but for that type of money, you could buy as many as 10 8Gb MicroSD cards. Or even 3 16Gb MicroSD. (which also work)
I created a template which I have on three 8Gb MicroSD and then personalized with what is special about each. Books/Mags, Music, Video. There is some of the other on each, but this works well for me.