Best PSU for Ravecoin rig?

Hey guys, I'm completely new to everything, just trying to build my mining rig, I need help choosing the right PSU. I am using only one graphics card, but in the future I will add to the motherboard, my friend told me to invest in a good PSU, so I am looking for a PSU with around 800-1000 watt, I don't want it to be cheap, but not expensive either, a reliable one. Thank you for reading.