The 1967 Volkswagen Bug combines all the best Bug features, and is most highly sought after. For example:
The '67 Bug has a 12-volt electrical system. This allows for brighter headlights, a more powerful battery that doesn't die as fast, taillights that can be seen even in the rain, and windshield wipers that move fast enough to keep the winshield clear! It will also accommodate a decent stereo system.
The body styling of the '67 is akin to the older models. More curves, more old-style lines. It has the bumper with the guard rails along the top, nice sweeping chrome-y things, and wider trim rings around the headlights. It includes cute little backup lights that actually work, mounted on top of the back bumper.