I am a user of 400D but I tend to agree with Daniel...
The really good thing about digital is you do not have to wait for lab to process your shots, you have them NOW..
But the resolution of 30Mpixels (which is easily achieved with film, plus the film sensitivity to red - including Ha - so no need for expensive mods)... all those facts support the idea that film is still not dead, far from it.
Have a look at this link, there are a lot of people out there doing film astrophotography:
http://www.cloudynights.com/ubbthrea...t/0/Board/Film
As far as scanners are concerned, I have Plustek7200 and it is pretty good (the practical resolution is ~3600pi, not 7200 as claimed, but, hey, it was ~$200!!). There are some issues but, if the shot is REALLY good, it pays off to go to the lab and ask for proper HiRes scanning.