The extra thermal compound is not necessary at all.
Also, the 850 PRO SSDs are much faster and only $30 more if you can spare the money.
The RAM is excessivley fast, with the speeds only marginally increasing performance by less than 1%, so go with something like this:
http://pcpartpicker.com/part/patriot-memory-pvl38g186c0kr for cheaper - spend the saved money on a 850 PRO SSD.
Hope this helps