[Rain Man]

I think it might be too early to buy tickets. If you can buy them sooner and you're absolutely, positively sure your timing won't change, you might as well. But with that much time, I think you should probably just check prices periodically over the next several months and buy when you can get a good deal.

As a note, the airlines are satanic and do not care about people at all. If you buy your tickets through any third party like Orbitz or Expedia, and you have any trouble at all, the airlines will leave you lying in a ditch and don't care whether you live or die. Even though I don't like paying satanic companies, you're best off to watch prices through Orbitz and then buy them directly from the airline site. I've never used those sites like that William Shatner place, so I don't know how they compare.