I have a private plate that is my name plus a random number. I like it because it makes my car ageless and it makes me happy.
It cost me £350 which is relatively cheap, some people spend that money on booze in one weekend.
I personally don't like the idea of a car related plate but that's me looking back at the old XR3is with lots of extra Ford and XR3i stickers plastered all over the car. But that R8 looked good.
At the end of the day, do what makes you happy and sod the rest of us!