It doesn't really matter when you buy something.
Yes, February "tends" to be cheaper, as sites will be unloading stock from after the holidays.
Ofc, the best time to buy is right after a new and better product line is released...like what's happening with the GTX 970s, 980s and 980 Ti s, right now.
Short version, don't hold your breath. Make a build at Pcpartpicker and keep an eye on it. Pcpartpicker will keep an eye on the prices and about an hour or two after it goes on sale, let's say on Amazon or such, Pcpartpicker will reflect the new sale price.