Newegg has a whole line of G. Skill Sniper rams ranging from 1333 to 2133, and they're all around the same prince range. I'm buying ram for my 3570k so are there any noticeable difference between these rams besides the Cas latency and ram voltage? Here are the is the link, (only looking at 4gbx2)P 8gb ram.
2133 is better that is just one benchmark well, if you are doing file compression on large amounts of data, you will notice the time it takes to compress or decompress the archive is shorter with higher speed memory.
however you only will notice a difference in benchmarks for gaming 1600mhz is the way to go for gaming 2133 is the way to go for OC and higher benchmarking scores whatever RAM you end up getting, the less voltage it is specified for, the better quality the RAM. Ram rated for 1.5V is more stable at any given voltage compared to 1.6V Ram.