I have had a lot of PAL to NTSC and NTSC to PAL conversions done through PostWorks New York and they are outstanding. I see they have a sister company called Orbit Digital in LA. Not sure if they offer the same services, but you could always try them.
Orbit Digital (West LA / Facility)
12233 W. Olympic Blvd.
Suite 280
Los Angeles, CA 90064
Ph: 424.298.2200
Fax: 424.298.2201
Walter Biscardi, Jr.
Biscardi Creative Media
biscardicreative.com