I had a '78 GS750E for many years, it was a great bike. I rode it nearly every day, and took several 2000+ mile trips on it. They're reasonably fast, even by today's standards, handle well and are very durable. About the only potential weak link is the stator in the charging system, and that's not universal - my bike never had a problem.
They came with both an electric start and kick start - remember, that long ago electric start on motorcycles was a new enough idea that people didn't necessarily trust them. However, the starter on mine was flawless.
I had a Windjammer fairing on mine, the one in the photo above is some other brand. They're out of style but they actually work very well for highway riding.
FYI, Prince's bike was a 400 Honda Hawk...he's a small enough guy that it looked pretty big when he was riding it. He had his bike painted purple by a friend of mine, he painted a couple of my bikes as well (none of mine were purple, though.
edit: http://www.thegsresources.com/ is the webpage for these bikes.