I used to have the NH-D14 on my i5. Great bit of kit, easy to install and works really well. There are 2 versions though, only one comes with the 2011 mounting hardware. I'm not sure which one OCUK currently have on their store page at the moment. You can get the 2011 mounting kit for free direct from Noctua by giving them proof of purchase.
I've currently got a 240mm AIO (
this)on my 5820K and it really does work well, but as setter points out, there is less to go wrong with an air cooler - it can't leak!