Hey,
Well, just to tell you one thing. Don't expect good Full HD videos from 500D, cause it has 20fps and that's weird. That's why I recommend you to record in HD.
Canon & Nikon with Video:
- Canon EOS T1i/500D
- Canon EOS 7D
- Canon EOS 5D Mark II & 1D Mark IV - too expensive I guess
- Nikon D5000
- Nikon D90
- Nikon D300s - D3s - D3s is expensive too.
Remember, DSLRs are not ment for quick action videos, you'll probably be best when recording something still (unless you go your own cool ways).
I have wrote an article on my blog about 'Which DSLR to buy', what's important, features, megapixels, brand etc. You can read it here - http://the-digital-photographer.blogspot.com/2009/11/what-dslr-should-i-buy.html
If you want to read my 'Which Video DSLR to buy', where I compare many of them, use this link - http://the-digital-photographer.blogspot.com/2009/12/which-video-dslr-to-buy.html