A few questions, or a popular vote please. Do you want to keep the logo/center callout the same as last year, and if so do you want to date it? The dating can apply to any center that is chosen, I think it is kind of a neat way to keep track and watch as time goes by.
Here's what I'm talking about with last year's center.
Standard center
With year added
And as far as dpi - the highest you can either post/host/or email. I can remove excess if needed, but cannot add resolution. And besides, if you send me a large enough image, you can get a poster of your own car made too.
Shameless pitch - oh the humanity!