I have built several gaming computers in the past 6 years but until now I have used HDD's. I am looking into buying a SSD within the week but I am not sure which SSD to buy. Currently I am looking at a 850 EVO 1tb and a 860 PRO 500Gb. For gaming/programming in visual (what I primarily do) is it needed for the tb or can I just get a 500 and that will suffice. I currently am using a 2tb HDD and am only using like 600gb of that. Is it worth the speed of the 850 pro to downgrade to only 500gb? Also, what about a 960 EVO PCI-E? What are your guys' opinions on my situation?