Doubt the prices will drop that much at all. The 2600k stayed about the same price when the 3770k launched. The 3770k stayed around the same price when the 4770k launched. The 4770k is still around the same price as the 4790k.
DDR3 RAM will likely not drop in price purely because of the usage saturation. So many people use it that even when DDR4 becomes the standard, the price won't drop drastically for at least a year until DDR4 really catches on - even longer if prices on DDR4 don't drop.
That aside,
http://pcpartpicker.com/p/2Gz3Q7If you want to drive down to Fairfax, VA to go to Microcenter, you can save about $90 on the CPU+MoBo combo.
144 Hz monitors are pretty much all 24-27". The prices range from $190 (when on the Acer is on sale) upwards of $800 for the XB270hu (1440p, 144 Hz, IPS). Average price for the "default" panels is about $260 (VG248QE, XL2411Z).