Get a 600cc or 650cc bike since you are used to CBR1000F. Benelli, CF Moto, and Jialing all have options that are not too bad. I went with a Jialing JH600 because I am fat, tall, and like dual sport bike riding position over a sport bike riding position. I am only thinking of selling the JH600 because I bought a BMW F800GS. You will be fine. Some very nice mountain road riding on the opposite side of Taihu lake from you. That is where I keep my bike as I hate riding in the rat race city of Nanjing. Shanghai is worse but you can probably skirt around the lake if you wanted to take a ride.