why get a 960? i'd recommend getting
GTX 1060 3GB or 6GB VRAM
or
RX 480 4GB or 8GB VRAM
modernly, you'll want to avoid any video card that has 2GB of VRAM. you'll want at least 3GB.
for the RAM itself, it doesn't matter much between 8GB or 16GB RAM. if you're talking about current games and ARK Survival Evolved then 8GB will be perfectly fine. if you want to play future games and have a better system for new games then 16GB RAM is good, but you don't have to get that now. you can always add more RAM later on.