There is no difference between DV, mini DV, DVCAM or DVCPRO images. Depending on where your movie is right now, (I would assume that it is still in your edit system), you might look at exporting in DVCPRO50 codec which will give you better edge detail and fine detail. Also, get some Sony DVCAM Mastering tape to record to. It gives richer color and is virtually drop-out free.
As Noah said, if you could export to Digibeta, you would most likely get a very nice image. This could be expensive though.
At NAB, Apple’s big dog and pony show was all done from a computer displaying an H.264 compressed file. WOW!
Why go with a different projector than the theater already has? Can you get in to do a few tests? What did you shoot it on? What are you editing on and with what codec?
Steve Wargo