Dan, it really depends on what you're going to be shooting. The 20d has AI Servo focusing mode which auto-focuses very well on moving objects. I've heard there is a software hack for the 350d but I dont know for sure. Also, the 20d has a bit better build quality or feel to it if you ask me. I didn't much like the plastic body of the rebel and rebelXT, but that comes down to personal preference really.
I was shooting with "L" series glass in the pictures you see. I own a 70-200mm f/4 L and rented the 400mm f/5 from rentglass.com for a few weeks and drug it around all weekend. Its a beast to carry around and pan with...much heavier than what I'm used to. Needs a monopod, at least for me.
I originally had the lens you have but sold if after a year (only lost $60 on it...thank you ebay!) and go the 70-200. Not quite as long a reach but the extra quickness in autofocus and sharpness are worth the tradeoff.
One big tip though. Don't rent or buy L series glass unless you really plan to sink some money into your camera equipment. Once you try shooting with L glass you won't go back....its a sickness really. Much like LFS has become
Vendetta - PM me your email address. File is about 8mb but I have it in large-format TIFF
Cheers for that, I brought a Mk3 USM 75-300 for mine, seems to work pretty well, I really need to look into using my 350D properly before I upgrade any further.
Oh, for the record, the 350D has the AI Servo mode too , but yeah, I agree with you on the body, I thought the rebel was a different (low spec) version of the 350D, is that not the case?.
to be honest I'm not sure. I thought the 300d was just a previous release to the 350. who knows?!
Get the feel of the camera, then go for the glass like you said.
come october I should have some more shots. Going to Virginia for the Rolex series race. Cant' wait