I know this thread is pretty old, but I thought I would share what I've finally made a decision on.
I was running the 212+ for most of summer, and was getting frustrated with the temps (hitting 80C at just 4.2GHz when stressing!). So, I've looked into a closed loop system here: http://www.newegg.com/Product/Product.aspx?Item=N82E16835106189
It isn't the well-known Corsair series, but it is the top rated system on Newegg (yet fairly new too from what I can tell). Plus with the MIR it's a pretty good deal. But thanks for the help -- I'm at more of a peace-of-mind knowing that I won't need to worry about a closed loop leaking.
So, another 3570k will be on water this coming weekend