Naked choice has to be the street triple Personaly think the gixxer 750 is a bit of a beast for a first bike.Its not far off the power of 1000's of a couple of years ago I chose an R6 as my first bike never thought id made the wrong decision.Turns in alot sharper than the Gixxer and not as much of a handful as the zx6 service intervals are 1000 mile more too.If sporty is what your after any of the 600 sports will do a cracking job,CBR,R6,Gsxr6,zx6r,Daytona maybe. I might be slightly biased toward the yamaha.Its never let me down over 23000 miles.