I'm in the market to upgrade and I'm looking at Canons. I've wanted to buy the 7D for a long time now, but I'm not sure I can afford to get the 7D with a good enough lens to fulfill my needs immediately. An option I suppose is to buy a 50D instead. What can you Canon guys tell me about the difference between the 50D and 7D? Is the 7D worth the extra money? the video is not very important to me.