Help for choosing new ram

I recently bought everything I needed to build a high end gaming computer but realized my ram sucked. Hama looking for dual channel 2x8gb ram. I have a asrock extreme 3 motherboard wich can support ddr3 ram of any speeI (I believe). I read woundering what the fastest ram is I could get under $20.  The fastest I found was g. skill trident x series F3-2400c10d-16gtx. Its timing is 10-12-12-31 and speed is ddr3 2400. I wasn't sure if it would be faster to get a lower latency and lower ddr3 speed or keep what I have. Thanks for your help

http://teksyndicate.com/forum/build-pc/memory-question/125904

did a huge write up about ram. i can tl;dr it, but you seem interested in how it works, so go ahead and read it. you might learn a few things :)