The Ripjaws for $85 and the Ripjaws X for $85 are basically the same. The Ripjaws X is a newer model so likely has newer chips on the memory board. The Ripjaws has likely been sitting in the warehouse a while.
The blue Ripjaws X for $130 was on a super-sale and you should have grabbed it then. It has better timings than either of the $85 memory kits.
The dark red $80 Ripjaws is the oldest and slowest of the bunch. Don't even consider it.
Here's the way I would rank them:
If price is your primary criterion: $85 G.Skill F3-10666CL9D-8GBXL
If you want better speed: $99 G.Skill F3-12800CL9D-8GBXL
If you want better speed and better timings: $130 G.Skill F3-12800CL8D-8GBXM