I was looking at power supply to buy, one that I was looking at was the Corsair RM550X that had a $20 rebate card when it is purchased, that deal is now gone but I had noticed that Newegg was selling A Corsair RM650X that has been Corsair Certified and Refurbished and has 1 year of warranty from Corsair and 30 day returns and replacement with it, is that safe to buy for my PC?