I am about to sell my 10D. Mine is pretty used and I think I'll probably end up selling it for about $400. I think it's a good camera as long as you don't plan to shoot a lot of action or do much precise focusing. My 10D made me a fair amount of money but it was also frustrating for me shooting mountain biking. For close photos and studio work it's been awesome. But for mountain bike landscapes it let me down many, many times. So, depending on what and how you want to shoot it might be a good buy. I am sure it's at least as good as your Rebel 2000. It's built better and I think it has better exposure and AF features. And 6-megapixels is plenty of resolution for most anything. I sold huge tradeshow images shot with my camera. Setup is the key. Resolution usually isn't as important as people would have you believe.

As you can see, I've got tons of experience with the 10D. So let me know if you have more questions.