Depends on your skill level. The 600r is an awesome learning bike and is very comfortable. I love mine but when I get in a crazy mood it leaves me wanting more. If you don't plan on pulling 3rd gear power wheelies all the time then the 600r should suite you fine
I have an F4i and I love it. Plenty of spunk but free of quirks. Motorcyclist magazine; "More confidence inspiring than you first college girlfriend, the pathologicly forgiving F4i is a good introduction to sport bikes."