have a good selection
Optoma is a well regarded make and 2 models come with build in DVD player- They both have built in audio though not much cop for a hall - [one was offered with a plug in adios system some time ago] Otherwise you will need one for Hall use if sound is wanted.
Epson is pretty good
You will need 2000 Lumens or more for hall use.
Do not get hung up on 'Special Digital' Screens
Like the ubiquitous 'Organic' in Supermarkets the Digital label is a simple a way of extracting more money.
Look for a suitable sized one in Charity/Secondhand stores.