Hideaway Beach is the best of the bunch. It's on the beach between Cabarete and Sosua.
http://www.hideawaybeachresort.com
Club Sabatini is the RCI time share wing of the Victorian House.
This is not strictly beach front, but located to the right of Sosua beach.
http://www.starzresorts.com
Take a look at the following for reviews.
http://www.dr1.com/reviews/
http://www.debbiesdominicantravel.com