Don't waste any time waiting and wondering 'what if.' There will always be the next best thing, and a plane could fall out of the sky and land on your head tomorrow. When the car no longer brings you any joy, sell it and move to something that you believe will. Tastes and preferences are constantly changing. In a few years when the STI version arrives, these cars may be the furthest thing from your mind.
If you have the means, do it now and enjoy the *#@$ out of it!