Almost anything is going to feel like a nitro-powered 18-wheeler by comparison. I switched back to my FZ1 this week and my first thought was "Oh my God, the weight!" My second was "Oh my God, the power!" And my third was "Oh my God, the weight!"
If you want to step up your dosage gradually, get a GS500 or Ninja 500. Then an SV650. Then the 600 repli-racer of your choice. Then a liter-bike.
If you want to skip steps, that's okay, but that's going to steepen your learning curve. The basic
skill set is the same for any motorcycle, and the power delivery is literally in your hands. Just don't go WFO right off the bat!