Hello, I currently have an i5 4670k, 8 GB DDR3, and an AMD 7850HD. I am soon going to be upgrading to the Sapphire R9 280x and I only have a 500w PSU so I am going to be buying a new one. I was originally set on the Corsair CX 750 Modular PSU so I have some room for upgrading in the future but do you think this is too much? I'm trying to avoid running my power bill up as much as I can. Or should I stay with this one?