I think it is a great idea, do you want to take the lead on the contest?
What you do it start a thread where members can enter their rides along with a few pictures.
Then you have thread with a pole to vote for the rides you like.
I will enter my new Xtz 1000 but right now it looks like all the other new stock rides lol.
I am working on getting Prowlertalk t-shirt made. so I when I get those I will gladly offer up a couple to the top finishers.