$100 even will get you 16GB of DDR3-2133MHz Kingston HyperX Genesis quad channel memory, perfect for an X79 based system.  These particular DIMMs are 11-12-11-49 and 1T, at their full speed with a second 1866MHz XMP with slightly tighter timings.  Legit Reviews paired this kit with an Intel Core i7 3820 and ASUS P9X79 Deluxe and while they couldn't get much of an overclock out of these DIMMs, a top speed of 2.2GHz with no luck tightening timings, the RAM Disk testing they did revealed some fantastic performance.

"The 16GB quad-channel kit of 2133MHz HyperX Genesis memory from Kingston Technology is a memory kit that is more than capable of handling any number of large memory usage computer programs, while also providing the speed of 2133MHz to ensure that our programs work quickly, and effortlessly. And having the ability of pushing this memory even farther to 2200MHz will ensure that overclockers will have some room to play…"

Here are some more Memory articles from around the web:

Memory