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I have something similar. Using CS5.5 For the most part, the largest consumer of power is the graphics card. I have a GTX580 that takes 600 watts and I am using a Cosair AX850 psu. Not a problem so far. First find out what the power consumption is of your 560. I think it is Corsair that has a program on their website for calculating the size power supply you will need. Check it out with your parameters. I found that the graphics card makes the largest difference when selecting the size of the power needed. You probably have enough headroom with the 850 if your 560 uses less that 600 watts. Power supplys seldom fail, especially the good ones. You will like your Corsair unit. That being said, your Antec probably has many more years of life on it.
Thank you Duanne. I'll use the Corsair PSU and keep the Antec with my old system - converting it into an audio editing workstation and render station.
I appreciate the answers. Thank you again!