If I had it to do all over again I would pick my lens first then the camera. I have a DRebel. Ihad been thinkingof upgrading to 20D. I went the camera store and tried it out. I set the camera on manual, activated the rapid fire mode and shot af 5fps, whow. Guess what, using the 18-55 kit lens most of the pictures didn't come out clear.
This is when I realized it wasn't the camera I wasn't happy with, it was my lenses..
Now I am seriously trying to decide between the Sigma 70-200 F2.8 or Canon 70-200 F4L. For wide angle I will probably get the Canon 17-40 F4L, unless the Sigma F2.8 spoils me into faster lenses.
But, I don't think you could tell the difference between a photo taken with the Sigma Lens on a Nikon D70 or a Canon D300. :idea: