I started on a GPX250. Great first bike as they didn't have all that much power so I couldn't kill my self strait away (though I'm still trying ha ha). All of these sugestions are good ones. But I have a friend who started the year out on a GN, killed it and now she's on a RG150 and her learning became much faster.
I think if you have a little experiance and are confident then start on a 250 if you can afford one. I like the CBR's but the GSXR's are cool and a friend of mine just bought a ZXR and it's one sexy bike.
Good riding.
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