I'm someone with more experience in the computer world, as opposed to the home theater world, but here's my advice:
Buy what you need, when you need it.
As long as it is in your budget and does what you need it to do, that's all you really need to worry about.
That's because electronics always get cheaper. If you are waiting for the best price, you will be waiting a long, long time before you pull the trigger and buy something. There will always be another sale, another killer deal, new models to coming out...some reason to wait just a little bit longer.