I would say if you like the kit and you were planning on putting it on anyways, why not buy it now when its the cheapest? You're going to hate yourself later if you have to pay full retail for a kit that you could've gotten for $700 cheaper a couple months back.
2003 Focus LX Red (RIP)
2002 Focus SE Red (SOLD)
1995 Jetta GLX: VR6, Intake, Exhaust, Lowered, 5-speed, you get the idea.