i used to have the 28-135, cost is about $400 and a nice little lens for the money
but if you want mind-blowing fucking glass, get the 24-70 2.8 "L"...it'll run you about $1,200 but it's worth every penny !!!
then, compliment that with the 70-200 2.8 "L" and you've got a great 1-2 combination for most any model shooting situation!
