I say show love for all gens. Have the banner switch through a 3rd-5th gen picture on rotation of accessing the site.
Also what's wrong with a popularity contest? You are chosing the "best looking honda" based on your own personal liking of the look of the car no? So it wouldn't be much of a surprise if the most popular choice was quite the cleanest looking lude. It's what all the users are going to be looking at, so why not one that a majority of the users will appreciate looking at to represent the site.