I've taken all my coins from armory and want to free up space on my hard drive. Can I delete all of blockchain and bitcoin core files without compromising my multibit wallet?
No matter what you choose, do not delete a single file until you have a balance showing in the new wallet that matches your old balance, whether via import, sweeping or whatever. Do not think that everything is going to be ok, make sure that it is before going forward. That is the only way to keep from losing what you have gotten and save yourself a lot of hassle.