Thanks for the responses. I was leaning towards the 24-70 but if the thing weighs a ton, the 17-55 might be a better choice. I know I dont want to be carrying around a heavy lens if its not a telephoto. I think I might go with the 17-55 now....
That 10-20 Sigma is also on my wishlist but that is for a later date after I get this all around lens sorted out.
I guess I'll swing by B&H and take a look at both of them.
Thanks again!