New pc upgrade for crossfire need help decideing on what i need & dont

i want crossfire so ive picked some stuff to get to upgrade
i live in canda so i wanna keep the prices in canadian dollars
i like direct which ive used for all my buys mostly so far
do i really need this powerfull of a PSU
or a new computer case
i like to oc as much as possible but probbly won't need to with the video cards in crossfire
heres my old pc

Motherboard z77 mpower LGA 1155 military class 3

CPU core i5 3570k 3.4 oc 4.1

CPU cooler hyper cooler 212 pluss

Video card

ram G.skill 1600 2 sticks of 4gbs of ram total 8gbs of ram i don't oc them i don't really understand the perpuse to when gameing

harddrive 500gb 7200rpm western digital black caviar

disk drive liteon disk drive

power supply CX600w corsiar 600watt

computer case azza Toledo 301

in the future i may get a blu ray player and more bigger harddrive

the upgrades chosen for crossfire

Video card 2nd radeon hd 7970 oc gigbtye 1000mhz out of box oc i oc to 1115hz

powersupply 1200AX 1200W ATX Fully Modular 80PLUS Gold

new pc case Thermaltake Chaser MK-1 ATX Full Tower

thank you to all that can help me out and
2 answers Last reply
More about upgrade crossfire decideing dont
  1. PSU is waaaay overkill, no way that you need 1200W to power an i5 and two 7970's. Think more 750W.
    Seasonic-X750, 80+ Gold Fully Modular. $160
  2. I did a powersupply calculate with thermaltakes powersupply calculator and it says a recommended 930 to 940watt powersupply thats with the cpu overclocked and everything runing at 100percent load
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