Are you shooting on film? If not, then a DI isn't really an option. If you start with a digital image, as I am going to guess you are, then you are inherently dealing with digital material, not digitizing film...
Neat fact -
One of the first digital intermediates was done on on Oh Brother Where Art Thou, scanning in the negative and replacing the print light process with something a bit more powerful and computer based.... There are a bunch of featurettes (sp?) about it on the DVD.
However, if you are shooting on film and considering a DI over a normal telecine daily, then be prepared to spend...
Keep in mind what your end format is going to be. If you plan to release to small festivals and blu ray, theres no need to go to anything larger than 2K, if even that. The DI is incredibly powerful, and it makes great use of film's latitude. It is, of course, incredibly expensive as well. Just remember one thing: If you go to a supervised transfer of your film for grading, bring your cinematographer with you! If you're the cinematographer, make sure you're present at the transfer/grading session(s)! The degree of control that a colorist has over your film when using a DI is palpable, so make sure that you hold the reigns tight on your images.
