may appoint with the advice and consent of the Senate and fix the compensation of an Executive Director, and such additional staff personnel as he deems necessary, without regard to the provisions of title 5 governing appointments in the competitive service, and without regard to chapter 51 and subchapter III of chapter 53 of such title relating to classification and General Schedule pay rates, but at rates not in excess of the maximum rate for GS–18 of the General Schedule under section 5332 of such title; and

may procure temporary and intermittent services to the same extent as is authorized by section 3109 of title 5, but at rates not to exceed $150 a day for individuals.