I use the 350D(unmodified) for DSO's. I guess you've read all the reviews on it by now, so no need for me to brag on about how good it is
I'm very new to astrophotography, only got my 1st telescope in May this year and i have produced images that i'm happy with with this camera...
keeping in mind that i have very limited image acquisition and processing skills and i have not started using darks and flats yet
, have a look at my DSO gallery on my website for images taken with the 350D.