Expansion advice

Hi. Looking into purchasing a Jupiter X. Am wondering what expansions will provide more realistic drums however, since i see session and power kit expansions are not available for it, but other expansions show they include other drum kits within them.

Also, what are the must have expansions? I like a variety of progressive rock, rush yes etc but also delerium, boards of canada, dj krush, dj shadow, afrocelt band, acid jazz like tribe called quest, sigur ros. Portishead, so pretty much running the gamut.

Thanks
Mark