Cyber Monday and Black Friday are ridiculous notions. These are not sales that favor buyers unless you are interested in purchasing technology that didn't sell well or was over manufactured the year or two years previous. You will never see cutting edge, THIS year tech in any of those sales or at least not with any discounts deep enough to make them any more interesting than any of the normal daily or weekly sales that happen throughout the year.
My advice, just built the system you want, WHEN you want, with WHATEVER sales prices you happen to find at the time. I actually don't want to go and spend any time finding it, but last year I showed another member how the exact same build was able to be purchased the August before these sales for LESS money than during them. The reason? Because the closer you get to Christmas, the more expensive THIS year's tech is going to get as supply runs lower and lower. I would never buy any PC hardware between November and December unless it WAS something from years past that I had been waiting to see the price drop on and happened to find an unbeatable deal on.
If you wait until the week after Christmas, that is usually when you start seeing good deals on THIS years tech, especially if it's something that they stocked up on but didn't sell.