I am not going to try and convince you that your choice is wrong, it is your life. I would ask that you consider the cost. In addition to any larger bike that will get you into trouble much faster, there is the cost.
Insurance at your age will be more.
A CBR250r gets 70+ mpg, any 600+ bike is going to get below 50, unless you ride real gently (then why bother
Tires and all maintenance will be more, maybe double.
I am "upgrading" from my totaled Triumph Daytona 675 which I rode for 24K miles over 5 years to a CBR250r which I hope to keep for 10+ years.
I loved the bike, but unless you plan to spend time on the track, it is allot of wasted power.
ps, if you have time, go ride the bikes. During Bike Week at Daytona and allot of bike events around the country you can ride any bike with a valid license. Some dealer allow demo rides too.