GSkill is every bit as good as Corsair.
The difference between Ripjaws and Ares is that Ripjaws uses higher quality RAM modules. I would not use Ares for a Sandy or Ivy Bridge build due to the higher system agent voltage required ( VCCIO-VCCSA ). See this thread and the answers by jaquith.http://www.tomshardware.com/forum/308402-30-skill-ripjaws-skill-ares
2N also written as 2T is the command rate.