good choice, chances are that airfares will be going up not down. Watch the airfares, if they go down and the airfare that you currently have isn't a promo fare with cancellation charges, cancell and re-book at the lower fare.
We weren't so lucky. We booked our flights and now they are cheaper!
Oh well, that is the chance you take but I needed to get 5 tickets so I thought I had better get them ahead of time so we would be sure to be on the same flight