I'm not writing from experience here, but I've heard good things about Canon's EF 28-105, which can be bought new at B&H in your price range. You might want to read through the reviews there. There's also the EF 24-85, which has been discontinued, but which I personally find to be much more interesting, and which also can be had at KEH for about the same price. I really like that extra 4mm of focal length on a full-frame 35. Out of curiosity, I read through the reviews at B&H on this lens, and its overall rating among reviewers was 4.5 out of 5 stars. Neither of these zooms are IS though.