For the OP, if you have biking experience & come from riding dirt-bikes, go for the 1,000cc, as anything smaller WILL NOT have the throttle response that you're used to. And this will get you into trouble on the road on a small capacity bike, since you have to rev the engine to find power, & that means speeding tickets.
My first road-bike coming from the dirt was a GSX-1100ESD, & it kicked ass. Good strong power everywhere, & I felt right at home straight away. I'm still alive & happy today 20+ years onwards, & have a GSXR-1100M & a Hayabusa to enjoy. The big-bores seem to last a lot longer too. I crashed an RF-900R that I owned for over 20-years with high-milage at the start of this year.
The beauty of the big-bores is that you can ride them in two modes...You "can" take it easy, use the engines very capable torque below 4,000-rpm, & drive it like a car. This means you have your fun & get to keep your license.
Open the throttle & most 1,000-cc bikes will easily see 100-mph in second-gear, & a huge smile on your face. 3rd will see around 130, 4th 160 etc etc, & you'll leave almost everyone in your slip-stream catching up. A Hayabusa will comfortably see 150-mph in 3rd, & has just as many more gears to go.
The only concession when having fun on a big-bore is tyre-consumption. Fuel economy is better than the smaller bikes with steady throttle. 20-km traveled, per liter of fuel consumed, can be had when cruising at a steady 90-mph, at 4,500-rpm on my Hayabusa. The Busa is geared for 33-km per 1,000-rpm in top gear, & red-line starts at 11,000-rpm, with peak power at 10,000-rpm.
The big bores handle just as well as the smaller bikes, it just takes a little more muscle, though I find them much more relaxing to ride.
You only live once, & big-bores are a more rewarding ride at the end-of-the-day IMO.