Each to their own mate, but remember the price you paid for the car included a warranty, so i say make use of it first.
Failing that, uprating brakes and handling should always be the first things to do....power goes ontop of those items. If it's just uprated discs and pads for the standard calipers, then may be worth waiting a while till they need replaced? A good set of springs, uprated anti roll bars, rear drop links and anti lift kit with full geometery setup will all work together very well.