Well you certainly should keep temps at a stable level. For me personally I dont like temps reaching/going beyond 85C for my 2 7970s. However for that lower-end card you dont need to worry about temps getting that high. I remember when I used to mine with my 6790 temps never went beyond 72C inside my case. If you really want to make sure you should download a tool to monitor GPU temps, like MSI Afterburner. Who knows, maybe you could squeeze in a nice overclock while youre at it
However, you wont need anything special or ghetto if youre using only 1 GPU.