cbr's are not comfy, and Im not a huge fan of naked bikes (though I do like the monster if you get the right color, and it screams). the rc51 looks a bit old school and also looks like it would be comfier than the newer cbr's.

not sure how tall you are, but I am 6 1 and the R1/R6's felt comfy, as did the GSXR 600/1000. Ever consider the Daytona?

also, you can get some opinions on your different choices on my forum (link in sig) when the server gets back online..