Yeah, the premium CPU waterblocks have reached a plateau. There literally isn't any real way to increase the heat transfer from the block to the water more than they already have. The last several blocks have only been able to shave 1-5 degrees off prior generations. I'd imagine the same will soon be true of the self-contained units pretty soon as well.
Core i7 4770k 4.2Ghz
Crucial Ballistix Sport LP 1600MHz 32GB
EVGA GTX 480 HydroCopper FTW
ASUS Xonar DX
Corsair Neutron GTX 240GB | Windows 7 64-bit
Apogee XT + MCP655 & Thermochill Triple 140mm Radiator
Corsair AX1200 PSU | Cooler Master HAF-X