This is one of the reasons I fly Jet Blue. I can book my flights at todays price, but if they drop at all, I simply call for a refund. My Jan flight came in at almost $400 RT, but I'm sure it will go down between now and then, and meanwhile I have my seats confirmed.
Its the price of rental cars that has me a bit concerned. I have not found anything under $400 for the 22 days I need one. Last year, I paid $301 for 23 days.