Think you made the best choice with the 30D, most people prefer it to the 350D, 400D and 450D. I'd like to change from my 350D to a 30D soon, but still need to upgrade some lenses first. I don't know if you've seen this, but there is a really good Canon forum at:
http://photography-on-the.net/forum/index.php
They have almost 140,000 users and there's 5 million posts you can read through which should answer most questions!! It is mainly American but there are a lot of British photographers there as well.