How Many Amps For a Graphics Card?

I'm looking to build a new PC around an 8320 and GTX 770. I know 42 amps on the 12V rail for a 770 and I was considering the XFX TS 550W PSU. So... can anyone recommend a better PSU? I would like for it to be semi or fully modular (I know the TS PSU isn't either) and under $70 USD?