Lens that are available for 60D, swivel screen (I have bad knees), Larger body (I have big hands) features on 60D. Just to name a few. Being retired I need to watch my nickels & dimes. I had considered a 40D prior. As you have said, your glass is everything!
ole sarg wrote:
You say you have outgrown the cameras you have. In what way, what do you want to do that you can't do now? Or, and this is really OK do you just want a new camera?
If the later get the best and newest you can afford that allows you to keep your glass.