Nobody seems to ever mention this.
Are you experienced in riding?
If not then try not to go for 4 cylinder ones.
4 cylinder engines provide optimum torque/power on the higher range of the rpm, are you gonna go that fast anyway?
2 cylinder engines provide a smoother and wider torque range across the rpm so you're less likely to do mistakes.

Regardless of what you choose, just keep in mind that the road is not a track.
Ride safe.