Corsair actually just released a new line of LCS-- the H100i and H80i.
Personally I like Corsair LCSs because they fit pretty well in my cases and don't weight down or block the CPU/Ram.
There are a lot of horror stories about them leaking, bad pumps, and so on, but I've had mine for years and none of them have had any issues other than not-so-great stock fans.
They may not be the absolute top-of-the-line for overclocking, but they can overclock pretty well with decent fans, and overall they aren't bad coolers.
what fan i should fit with h80 replacing the stock fan i use corsair 400r case