Each Public Defender, including the Chief Public Defender, shall receive in full compensation for his services an amount to be determined by the Public Defender Administration Board; Provided, however, That the salary of a Public Defender shall not exceed the salary of the Chief Public Defender. Salaries for clerical and investigative staff shall be determined by the Chief Public Defender. The Chief Public Defender shall recommend to the Public Defender Administration Board such assistants as may be necessary. The Chief Public Defender shall prepare and submit an annual budget for salaries and expenses of the Office of the Territorial Public Defender to the Legislature.