From my previous build I've changed three things; GPU upgrade, downgraded my CPU cooler, upgraded my GPU's cooling, and swapped out my NZXT's X61 stock fans for Corsair's Mag Lev 140's. My system's now quieter and cooler since the GPU (the main source of heat) isn't dumping hot air straight into the case anymore.
I'm glad I moved the AIO from my CPU to my GPU. My CPU's only rated at 65W (stock) and wasn't putting out much heat even when OC'd. Anytime I ran benchmarks or played VR games, my CPU would be in the high 40's/low 50's yet my case would be HOT to the touch as my GPU was in the high 70's. It was within operating temps but personally, I'm not okay with any of my hardware running above 60C during general use (Yes, I'm a picky SOB). After installing the AIO, my GPU now maintains a 2.1GHz OC on the Core without any drops due to spikes in the temp limit and no longer heats up my room like my old FX 8350 once did. The only "issue" I have with the OC now is hitting the power limit but that's fine. Just be wary that NZXT's CAM software is far from reliable. For me, it never automatically launches when my PC starts so I have to manually start it every single time. Otherwise, my GPU will be back in the 70's approaching the 80's in seconds if I were to launch a game as the fans and pump will be idling.