Samsung or Crucial, but Crucial sells some "performance" memory rated for higher than normal voltages, 1.65V (DDR3) or 2.0V (DDR2), and performance memory should be avoided, regardless of brand. Few people realize that Samsung memory modules are available on the retail market.
The other companies mentioned do not make chips and typically use lower grade ones and do not test them very strictly. If cost were no factor, I would do everything to stay away from those minor manufactures, which include Crucial, Kingston, GSkill, Geil, Mushkin, A-Data, and Patriot.