I know you're right about the RAM thing. I placed it there more as a future proof thing than anything on my two possible setups. 8GB of 1600Mhz RAM would be just as fine in a system today as would be 16GB 1333Mhz RAM but for a much cheaper price.
@ OP: HERE is a list of 8GB (2x 4GB) DDR3 1600Mhz kits available for less than half of the price of the 16GB kit I placed in my previous post. IMO, you can go with one of these kits and either the AMD or Intel setup I picked out and be under budget on both systems. You would still have to use your 6570 and upgrade that later though.

