Also looking for 8-16GB ram recommendations under $100 if possible. This is a gaming setup.
I've seen some very recent deals at Newegg
for 2 "matched" 4GB RAM 1866MHz modules at US$51 up to 2400MHz at $59 (I'm pretty sure it was GSkill or I wouldn't have been interested enough to remember). However, those were discount email offers not published on their website (you have to be on their list). The low prices may not be repeated before the holiday gift season.
On many if not all their modules GSkill has a lifetime warranty. I've used GSkill, Corsair, and PNY brands for builds since DDR3 came out, without encountering a single bad DDR3 module from any of the three brands, but have disparate results even in the same brand using "matched" pairs, when attempting to overclock the RAM over 5% of the rated speed (IMO as a practical matter, it's not really worth the effort to OC for just 5% over spec).
Some GSkill heatsinks can also interfere with installing some CPU air coolers.
Also, how the CPU/system manages memory interleaving can also affect performance. For example, 2x4GB at 1866MHz may be faster than 1x8GB at 1866MHZ with no OC effort.
However, check your CPU and system re RAM speed maximums. Some AMD CPUs and/or motherboards do NOT support memory speeds over 1866MHz RAM very well despite what may be on the memory specs, and buying faster memory may be a waste of money...and if overclocking, then tweaking CPU, Northbridge, and memory voltages, etc may not be as viable/stable under those limitations.