The 650 ti is a basic short card and will fit in almost any case. Since you are going to be doing video/rendering, I suggest you START with 16g of ram in a 2x8 configuration. You may want to up it to 32 later, and by using 8g sticks, you won't have any non-usable sticks. Just be sure to get ram that DOES NOT have heat spreaders - (1) they will interfere with an aftermarket air cooler, and (2) they do NOT provide any benefit except bling.
Your choice of cpu is great for what you want to do - all the cores will most definately by used. That's another reason to get an aftermarket cooler - the more you tax the cpu, the hotter it runs. The Hyper 212 has been around for a long time and is very well regarded. As far as the case goes, you are going to want a case that allows good airflow to help with heat dissapation. The HAF 912 is a full tower size and comes with 2 120mm fans, to which you might want to add one more 120. Set up two fans as intake in the front of the case and one at the rear as exhaust.