One thing to keep in mind with switching from film to "D" is your back end. Right now you shoot a wedding, throw film in a box and bring (ship?) it out out to your lab. Then you sit down, drink a beer, watch TV, and a few days later you get your images back. Throw some proofs online from the CD so the family can place orders and start sorting proofs and arranging an album.
With "D" you are your own lab in most cases. Shoot a wedding, unload some cards, make backups of those cards, make backups of the backups, import them all into Photoshop/Lightroom/NX/CameraRAW or what have you, edit, adjust, fix, etc, etc. Then either pull your hair out for two days making prints on an expensive inkjet, or send them to a lab for printing. Also, post proofs online for the family to order from and arrange and album. Maybe sneak in a beer while the cards unload.
You can't forget the backend expense (computer, software, upgrades, drives, etc). Not to mention the time, expect to double your time behind the scenes from what you spent at the wedding. If you figure what your time is worth, that can be a lot of expense. Time you could be out shooting something and making money behind a camera not in front of a monitor playing photo lab.
I guess the question to ask is are you saving money by doing more of the work yourself. The answer to that is probably yes. But is it worth it.