Encode a video or dvd with software like handbrake - stresses the cpu to the max
Play a couple of games where you max every setting - should at least stress the gpu to the max
Running any other bench or stress test, will give you results that will never be anything like the results you are going to get in everyday use.
for instance, software like intel burn, or other torture application is just that, torture of your component, and heaven or valley are synthetic, and doesn't use api's and call routines typical for gaming or encoding.
Hope this helps, and nice rig! looks very clean!