like was said,it all depends on what you want to do.
if you want to ride a sportbike don't be afraid of a cbr/yzf/gsxr 600.i realized after my first summer that i could have easily started on a 750.the power difference is not that great,if you're going to kill yourself on a 600 you're going to do it on a 750 too.
i've ridden all manner of sportbikes...my cbr,yzf600,gsxr750,vfr800,rc-51...they're all cool,all fast,all easy to stay alive on or get killed on.it all depends on you.you know yourself the best.if you want to get a sportbike so you can do big wheelies in traffic and try to pick up chicks you will probably dead within a month.if you're more level-headed and aware you'll do better
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whatever you do,don't buy a "dual purpose" bike.if you want a dirtbike,buy a dirtbike.if you want a streetbike,buy a streetbike.if you buy something that's supposed to do both,it will,barely.probably just enough of both to be marginally above useless.
i can't wait until the rain lets up so i can ride my bike every day.i just put new d207's on it and nice new brakes
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later,sean