An F4i is just that, a CBR600F(4I), the RR is the sportier model of what was once a sportsbike in it's day (and the original 600F was more than the limits I'd ever reach riding in terms of its ability). This goes for most of todays bikes. You'll get your knee down on my DR650 with the right rider and tires on it...
I remember the ZZR600, or what we here stateside know as the ZX-6E, being the best 600 SPORTbike! This was in 1990 of course. I'm thinking of changing to a sportbike myself and am considering one of these just on pure cost
Ok I'd love an 05 636 or an earlier R1.
As for your size, sure it has a little to do with things but it's more about technique -especially throttle control.
To some extent, a 600 is a 600 - it'll be a quick bike whatever you pick (assuming 4 cylinders now) If you are going to ask will you be safe on an F4 but not on an RR, I think you can pretty much guess that the extra 15 or so HP of the RR won't get you into any more trouble than the 100 or so of the F4 will in the first place!
People have started out on R1's and survived, but it doesn't mean its a good idea
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