I currently have a Rebel xsi and use a 300mm f/4 L 90% percent of the time but I'm looking for something better on the camera end of the deal. So I'm looking into a 50D and have some questions: Is the 50D worth the extra expense over the old 40D? Are refurbished ones reliable? And how does the image quality compare against cameras like the 7 or 5D?


Thanks.