For metal storage we reccomend Bisley for excellent build quality and user orientated approach to design. Bisley filing cabinets are still available in the traditional form factor we are all familiar with from 2 drawers to 5, view the range here.
A popular alternative to the traditional filing cabinet are Bisley combination units which combine filing capacity with cupboard storage for stationary etc. One advantage of these units is that they pertrude less than a traditional cabinet and sit flush with other Bisley storage such as tambours, bookcases and cupboards providing an neat and uncomplicated office space.
These combination units are available in multiple configurations to suit your needs, get in touch to discuss your storage needs.