I'm not sure the true question of this post. If you are asking which to purchase, Corsair DDR3 2000 or Corsair DDR3 1600, I would go with the DDR3 2000 since they are both at Cas9.
To the other statement, Corsair is the better manufacturer than Kingston but I would feel comfortable going with them along with Mushkin or G.SKILL. I was a support of OCZ (currently running a 6GB set) but they have been having issues as of late, so I wouldn't recommend them at this point.