DeusEx Human Revolution recommends 2GB of RAM for your whole system, the most I've ever seen a game recommend is 4GB.
8GB will be more than enough for gaming purposes.
The different RAMs aren't added together. The GPU RAM is dedicated to GPU functions, the CPU cache is dedicated to CPU functions, and the system RAM focuses on everything else you're running.
Only need to take CPU cache into account when comparing CPUs, only need to worry about GPU RAM higher than 1GB if you're using a large Tv at high resolutions as a monitor, and the system RAM will work fine for your purposes.
I will suggest Newegg.com - G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL7D-8GBRH
for $6 more ($1 more if you use the promo code by 9/5), its a little bit faster than what you've picked.
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X