Hi sks1127,
I know this is late, I just went from a Ninja 650R to a 2012 Suzuki GSX r750.
A 1000cc bike might be too much for you, even for me. So I went in between with the 750. I’d go for that if your looking to go supersport and want something bigger then 600, less then 1000. It’s also great on insurance too.