Like others have mentioned, I'm also one who makes reservations for my hotel as soon as I decide I'm going, especially around any holidays. I think I had our honeymoon suite reserved 8 months ahead of the wedding, before we even had a venue for the wedding, LOL, because I knew I would get better prices the earlier I booked.
I've been told the best airline prices are 2 months before the anticipated flight... I'm flying at the end of January, and finding some GREAT prices now ($93 from Portland on Southwest with 1 stop and no plane change into SNA, which is usually a $120-160 flight). Just keep an eye on prices, and buy as soon as you can afford/find a good price!