I'm looking to buy a flexible high quality lens for macro photography. As an illustration, I'd like to be able to be a foot away from a person and be able to capture every detail in a part of the face or eyes, etc. I'd like to be able to shoot droplets on a leaf, texture of flowers, insects, etc. Can anyone recommend a good lens at a somewhat affordable price. I was thinking the new Sigma 70mm f2.8 but it has that fixed 70mm...A nice range for multi purpose would be nice....Please enlighten...