Because you stated that you do not require full-text indexing capabilities, your needs probably are not in the litigation support area, and are more document management oriented. Both are solid text retrieval products worth looking at and would most likely meet your needs and then some. There are really only a few good choices out there. These programs will give you the base functionality you described, and a whole lot more. A DMS generally can handle any object in electronic format including images, electronic documents, e-mail, voicemail, faxes, audio and video files.
Most packages have excellent version control, and basic routing and publishing capabilities.
Additionally, the archive features and history tracking are added benefits of these packages. Both iManage and PC DOCS offer paired down versions of their product for smaller firms. WorldDOX on the other hand, was designed primarily for small to mid-sized firms in mind. Because WorldDOX does not require the extra hardware and upkeep of SQL systems, it tends to be a bit more affordable from an implementation and maintenance standpoint. Before proceeding with the selection and installation of any of these products, however, carefully consider your firm's full requirements in this area.