I'd go back to Newegg and look for a single rail psu.
Your watts seem fine but that dual rail @18a might be a problem.
hey I just wanted a second opinion before I shell out all my precious moneys getting these parts. and comments or suggestions would be greatly appreciated
intel core i5 2500k
sapphire radeon 6850
500 GB hard drive (Caviar Blue)
Kingston hyperx ddr3 8GB RAM
Asus P8268 motherboard http://www.newegg.ca/Product/Product.aspx?Item=N82E16813131786&Tpk=ASUS%20P8Z68-M%20Pro%20LGA%201155%20Intel%20Z68%20HDMI%20SATA%206Gb%2f
Coolermaster extreme power 500W http://www.newegg.ca/Product/Product.aspx?Item=N82E16817171031
plus windows 7, creative labs sound card, logitech mouse and keyboard etc etc