20° is nothing to sneeze at! Looking good. My only concern would be the VRM's. Now that you have the Antec in there you're going to have very limited airmovement in that socket area. Typically with an aircooler you'd have the turbulance swirling around down ther but that's gone. I had that issue when I first went with the TT AIO cooler. I also had the M5A 99FX pro board. The combination was putting my socket temps about 20° higher than my cores. If this happens then your board is going to throttle that CPU to keep the VRM's cooler.