I believed you all the way up to the part where you took out a Z06. I know a modded WRX can be very fast, but I have to believe that a win over a Z06 had to involve driver error or incompetence.
It will be a cold day in hell before I choose not to buy a car because it doesn't have freaking DVD navigation system! In fact, I'd rather take a car without it.
Buy a map and use the money you save for performance parts.