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

[elvos]

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 canda.com 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 http://www.newegg.ca/Product/Product.aspx?Item=N82E16813130660

CPU core i5 3570k 3.4 oc 4.1

CPU cooler hyper cooler 212 pluss

Video card http://www.directcanada.com/products/?sku=16950BD0659

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 http://www.newegg.ca/Product/Product.aspx?Item=N82E16817139028&Tpk=CX600

computer case azza Toledo 301 http://www.newegg.ca/Product/Product.aspx?Item=N82E16811517013


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 http://www.directcanada.com/products/?sku=16950BD0659

powersupply 1200AX 1200W ATX Fully Modular 80PLUS Gold http://www.directcanada.com/products/?sku=11180AC4403

new pc case Thermaltake Chaser MK-1 ATX Full Tower http://www.directcanada.com/products/?sku=16950AC0391


thank you to all that can help me out and

 

[manofchalk]

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
http://www.newegg.ca/Product/Product.aspx?Item=N82E16817151087

 

[elvos]

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