Hi T! If you are after a sportsbike, I guess your budget comes in to play. You could easily fit on a RVF400 and they are nice bikes. If you feel the 400 cc engine will be too small for you in the long run then look at something say, like the GSXR600 or similar as they have narrow seats and lower seat heights than say the R6/CBR600's of the world.
There is a company out there (I think his name is Dr Hull or something like that - hopefully my wife, RVFBabe, can confirm this) that offers a service where he lowers the bike for you, but yet maintains the essence of the bike, i.e. it being a sportsbike. I don't think he charges all that much (especially in the world of bikes as well!) for his service.
