Define best looking. I think its something that makes you want to come back to see it again and again. Kind of like the girl down the street. This is still my all-time favorite. The 73-74 Elsinore's. I had just started racing the 125 class when they came on the scene. Everyone just drooled all over them. I left an XR-75 for a KX-125. Simplistic, but high-tech (for the time), an exquisite sound (it hurt your ears but sounded so awesome), the smell of Bel-Ray mixed in the fuel, watching it spit from the exhaust and blow on your hand - pure heaven on earth. There is still nothing like the sound of a 250cc 2-stroke screaming on a track or winding out across a field. Yeah, some people find that annoying now - not me.
The V-Max is second on my list. I saw one at Americade years ago (early 90s) that was completely chromed out including the frame and bottle of NOX. Red and blue fiting everywhere. Supercharger (not tubo) hanging out and off the side. It had a slightly stretched rear end. It also had NJ tags the said: "IL-WIN". Impressive. The pic attached isn't it, just kind of similar.