I think it's funny that the OP was sceptical that people would buy White and then Black 2, when it seems to be the most popular option in the poll :P
Personally, I went with White and White 2. I was super excited that we'd finally gotten sequels again (if you count the Johto games as sequels to the Kanto games, which.. everyone does), and I wanted to do it "right", to sync up my story from White version and have an adventure that continued with "my White universe". Plus I'd be able to trade my Zekrom from White for Black Kyurem anyway, and wanted to give Reshiram a shot.