Which PSU should i get/psu requirement for sli

Hey, i am currently in the process of building a new pc. I already bought a Asus P8Z77-V LK mobo, 1tb hdd, 16gb ddr3 ram, and a dvd writer, and also a evga gtx 550 ti 2gb video card. i plan to get an i3/i5 cpu. the question now is, i plan to sli (get a second video card) in the future, and was wondering which power supply should i get from my current items? I read something about the 12v amp requirements, and not sure which psu is good enough. My budget is around 75-85CAD, hoping for black friday for psu. but what is the recommended psu 12v amp for everything tho?

i found these, not sure if they are good enough:
http://ncix.com/products/?sku=71919
http://www.ncix.ca/products/?sku=75200&vpn=TR2-700W&manufacture=Thermaltake
http://www.ncix.ca/products/?sku=63239&vpn=P1850SNLB9&manufacture=XFX
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More about which requirement
  1. get the XFX psu very good make and reliable will handle your system no problem even in sli
  2. jc4ever said:
    Hey, i am currently in the process of building a new pc. I already bought a Asus P8Z77-V LK mobo, 1tb hdd, 16gb ddr3 ram, and a dvd writer, and also a evga gtx 550 ti 2gb video card. i plan to get an i3/i5 cpu. the question now is, i plan to sli (get a second video card) in the future, and was wondering which power supply should i get from my current items? I read something about the 12v amp requirements, and not sure which psu is good enough. My budget is around 75-85CAD, hoping for black friday for psu. but what is the recommended psu 12v amp for everything tho?

    i found these, not sure if they are good enough:
    http://ncix.com/products/?sku=71919
    http://www.ncix.ca/products/?sku=75200&vpn=TR2-700W&manufacture=Thermaltake
    http://www.ncix.ca/products/?sku=63239&vpn=P1850SNLB9&manufacture=XFX


    Hi jc4 - If you can act quickly (6 hrs left), this is an outstanding deal.
    a top shelf PSU, Seasonic X-750 Gold for under $100

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

    Tom
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