I'm in the market for a new camera, specifically a Canon. I'm an amateur photographer that mainly takes photos of people/everday situations. Not a lot of nature or sports photography. I've come to love the 20D because one of my favorite photographers uses it. It also fits into what I'm willing to pay, likely for a used one, and that is around $500-700. But I've also found the 30D and XTi to fall into that price range. I'll admit my knowledge of cameras is pretty basic so in reading reviews I've been a little lost, so I thought maybe someone could help me here. Of those three, which one do you think would be the better choice? Any web sites you'd recommend to look for used cameras? I've seen the 30D usually priced $100-150 more than the 20D - is that extra cost worth it? Any advice would be appreciated! Thanks.