need recommendation for 300m zoom lens?
Most of us can agree that the Canon f2.8L lens referred to above it just too dear.
There is an optically excellent f4 version with IS available for about $1,100 (plus there is a rebate in the US at present).
I haven't found a cheaper lens that meets your specification. You want very good optics and IS in a 300mm prime lens.
The Canon 70-300mm f/4-5.6 IS is in your price range (under $600) but it is nowhere near the optical quality of the 300f4.
My recommendation is to take your camera to a local shop that sells both lenses and try both of them on the camera. Then you have a financial decision to make :> )
'The important thing is not to stop questioning.' Al Einstein
I use ImageShack for Free Image Hosting[URL= http://www.imageshack.us]