I know the feeling very well Rob...
I still remember when the new owner left my place and I heard for the first time the exhaust sound from outside the car. a very weird feeling.
as jay said, make sure your name stay sticked to the car. when I sold my glanza, I told Niven that I wanted first option if he had to sell the car again. In fact he sold the glanza one week ago, I saw the car on the road with the new owner crowsing my way. I felt like someone had stolen the car !!
But, I'm sure you'll have fun with the Runx too. it is still a Toyota
BTW, nice photo, you need to send high rez version to me for the calendar contest !