Thanks Trevor, good link. I don't like the idea of as plastic mounting ring so I was think maybe I should just go with he 18-200 but the reviews aren't that great for that lens-especially since it's over 2x the price.
I don't know anything about that lens, but will encourage you to keep this in mind when reading and analyzing reviews:
Reviews for a professional grade lens are going to be from pro's, who are both more knowledgeable and exceptionally acute and picky at any minor issue. If you read a review from Aunt Sally who is just gushing over this amazing lens that was "hugely expensive at $400 so it better be good" when she took "colorful" JPG pictures of her daughter at the soccer game last weekend, you are going to get an entirely different impression, neither of which are really relevant to where it seems YOU stand in knowledge, expectation, and skill.
In the Canon world, the cheap kit lens that comes with the Rebel is really not good, but I can find thousands of reviewers who love it, after being used to a cheap PNS. I can also find thousands (well, okay, maybe only a few hundred) of reviewers who did not like the 70-200mm F2.8 L IS lens from Canon, which is widely regarded as one of the sharpest lenses ever made (an assertions that my personal experience completely supports).
Just bear in mind the user of the various lenses you are reading about, is really what I am trying to say.