Thanks for the kind words, KidKB. I haven't used my computer much in the last few days, but so far I'm showing up cooler than I was even in BIOS, which seems to be the most reliable indicator. I'm going to follow Cloud's advice and try turning the Q-Fan back on.
I don't know how the H100 would work for me, but it might work well. My PSU is on the bottom of my case, and I assume the radiator could be mounted over the two 140mm fan spaces. I'm probably going to just stick with the 620 for now, though.
One question about the Corsairs, just out of curiosity. I've seen some say they prefer the Antec because it takes air out instead of dumping it into the case, but wouldn't that be controlled by how you install the fans? I believe the Corsairs and Antecs are made by the same company, so I assume they could work the same (but am probably wrong).
Right now, I'm just in a pull configuration myself. I've got the extra 120mm, but I need to get long enough screws! I could have nicked them from the 920 I returned, but I know Fry's is just going to stick it on the shelf and I'd be screwing somebody up (though, really, they're getting used thermal on the pump face and already-applied adhesives on the motherboard bracket
Edit: I put in a ticket with Antec yesterday to ask about the Q-Fan. I just checked my e-mail and they answered that it should be disabled with the 620.Edited by Rasdock - 8/13/11 at 1:35am