Case, go with whatever is aesthetically pleasing to the eye for you and still provides enough airflow inside the case. That's my suggestion.
Motherboard, stick with a LGA 1150 motherboard, The 2011 socket is way too expensive for an average gaming system.
CPU, you could just stick with an i5. Not much gains going up to a i7. Unless you do stuff like cad, video editing, live streaming, or other multithread intensive tasks, you really don't need to get the i7.
RAM, if you want 16gb of RAM, just go with the cheapest ram that's at least 1600Mhz and cas9 latency.
PSU, Corsair PSUs are a bit overpriced in my opinion. For the same price of some of the Corsair PSUs that are actually recommended, you could find a PSU of another brand that's probably either higher quality, better priced, or both. If you want a SLI set up in the future, I suggest a EVGA supernova g2 850w.