I had a 1985 GPz 550 from the late 80's through the mid 90's. Although I have had faster, quicker, and bigger bikes, the 550 GPz remains my favorite as it was flickable and very mild mannered but would still scoot when asked to. It was also very comfortable and rode smoothly.
Mine had the "digital dash" on the gas tank which showed fuel level and a few other things I cannot recall any longer.
Scot W - are you still dirt biking with the family? If so, I might call and pick your brain.
One of my friends had the KZ1000R Eddy Lawson replica (which I used to get to ride in the mid 80's). Now that bike was a handful and downright squirrelly. Fast, but scary at times - as the engine was well ahead of the suspension.
Rob