I just got done testing the Cooler Master MasterLiquid ML240R RGB and it is surprisingly good performing for an AIO, even doing slightly better than some 360's. I am about to start testing the ID Cooling Dashflow 240, which looks very well made in person, even using real compression fittings on the tubing ends.
I am also a big fan (pun intended) of the Dark Rock 4 and Dark Rock Pro 4 (even the Dark Rock Pro 3) as they are some of the most exceptionally well-built air coolers I have seen or tested. They have build quality and construction that is just unbelievably well done.