Have no doubt that Z1NONLY has posted exceptional power supplies, I just posted lower wattages for these power supplies since I believe you don't need all the excess wattage. The HD 7850 generally needs 24 amps on a combined 12v rail.
Edit: Haha, just realized bigcyco posted 2/3 same power supplies will re-do my list to include others. Goes to show how good those power supplies are if people are selecting the same ones.
On a side note, if you do plan on overclocking make sure you get a nice cooler. Also I am a bit leery about the Biostar motherboard. Don't like Biostar that much not too reliable, might want to re-select the motherboard, choose ASrock or Asus.