I have to say I don't find enough difference even with the displacement increase to favor one year over another...except the color and maybe the tubeless wheels (very nice). Look for one that's pretty much stock so you can make your own mods and not have to undo the previous owner's "improvements."

A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)