hi i have pokemon white version & i was planning on getting white 2 or black 2. most likely was white 2 because of me having white 1, but now black 2 seems to be the one i'm gonna get. but does it matter tho which one i get? are there some key differences in the games? or is there something in white 1 that i need in white 2? & other way around for black 1 & 2? also does or has owning the previous version, white or black affected which one you purchased or pre-orderd?