lol
Ok first for desktops you want 1.5. 1.35v is mainly for laptops (Called DDR3L)
The Sniper and the RipJaws are pretty much the same for the most part. I have the Snipers 2400 MHZ ones in my PC.
and then they are all 1600mhz so that is good.
Mainly just comes down to price. The CAS Latancy isn't as big of a deal these days because the RAM is so fast you don't see much of a different with lower latancy versions vs higher.