This probably won't be much help but I recently got the 30D to replace my 20D when it was stolen. I figured I might as well upgrade since the price wasn't that different. I'm not sure if I'm as happy with it as I was with the 20D. I was comfortable with it (the 20D) and probably would not have upgraded otherwise. If you have neither, I think I'd go with the 30D but I wouldn't recommend upgrading just for the sake of upgrading. As for the larger LCD, I don't have an opinion either way. The best thing so far is the ISO increments being smaller.