I have bounced around a bit trying to find out what I liked taking pictures of and which lens was the best to do it with. I ended up finding out that this Sigma 70mm f2.8 Macro really fit the bill for me. Also even though this lens has been around for a while there are not many reviews as compared with the Canon 24-70.
So I wrote a little blog post and video on my process of getting there and a little bit about the lens. You can see it here:http://www.bobkeenanphoto.com/sigma-70mm-f2-8-macro-lens-and-how-i-got-there/
BTW its is a Great lens.... at least for my application and its my new walk around lens.