Man, this is tough, real tough. I have loved most of the bikes i have owned. So if you will allow, i will pick my favorite three.
1980 BMW R100RS, wonderful machine. Traded it for a car, bad mistake...HUGE.
1997 Suzuki TL1000S, 0-100mph in a wink and it handled like it was on rails. It had to go, i think eventually it would have killed me.
1970s??? Honda CB400Four. The original pocket rocket. A bike the size of a 200cc but with the power of a 550. Great smile maker, and so much fun.