Thanks for the input so far fellas. Very useful stuff.
Steve, I'm familiar with some of Greg's photos with the Pentax Kx, hence my inclusion. I'll keep it on the list because I'm not too fussed that it doesn't have ability to be controlled from a computer. Remote/wireless trigger is ok.
Paul, interesting about the 550D. Good to know. Anyone else have a similar problem with this cam? I also hadn't considered the 30/40D because of the age (2007), but second hand might help save me a few bucks.
Merlin, when you say "modded" do you mean with the IR filter removed? The 450D / 1000D are at the top of my list as well as the Kx.
Cheers,
Carl