You talk about 18-200 or 70-200 and then 180-200. I assume that this is a typo?
If you're looking for a one lens does all go for the 18-200 but if quality is what you want you may be better going for the 70-200 as the shorter range zooms are often more highly thought of than the one lens does all type.
A "wide" is worth having though, IMHO.
-------------------- Alan's defence lawyer claimed that "Booze played no part in his typo's."