I agree that it is very well built, probably the only one that is better build in the same sort of level is the D200 from Nikon but that is going to put the price up a little. I love my 30D, it is great in the hand, lovely weight and the results are spot on. Even after cropping I quite often sell work at 15x10 with no problem at all. Lenses are going to be the only thing that will control the sort of thing you can shoot well but the body is up to the job. Also Canon have suggestedit is designed for100,000 shutter actuations so that is a good start also.
Thanks for the report on your experience. I appreciate actual user exp. , especially from a professional who I would think would give a camera a real workout, more than I would.