I'd go ahead and get White, since that's what most people are playing right now, so if you're into Wi-Fi trading and such, it's down your ally. As for the next main series game, no one knows a release date, or even a name. I think it's safe to say it'll be another year or so before we see another main game. And I wouldn't really bother with the scheduled spin offs. Anyway, this doesn't really merit its own thread. If you have more questions about White before you get it, you can ask in the Black/White quick questions thread.
Locked.