If you are limited by height, suggest you go to an AIO solution like the X61 or the Corsair H105 if you wish to Extreme Overclock with limited Air Cooling space. For s small OC, you could consider the more compact Corsair H75 - I use it on my i7-4790K with a OC on 4.6Mhz (turbo) and it doesn't get off idle - i.e. cannot hear those Corsair SP fans at all.
Don't skimp on your cooler when Overclocking is my recommendation (I wish I got an H105 in hindsight
Good rankings on Cooler performance here -
http://www.bit-tech.net/hardware/cooling/2014/02/07/corsair-h105-review/2
The NH-L12 is one of the smallest and most efficient coolers you can buy - designed for ITX backplateless builds, it performs about the same as EVO212 but is better suited to i3 and i5's rather than i7s that the EVO is designed for.
The d9 is 110mm, the u9 is 125mm tall - performance is about the same (the U edges the D by about 1 degC - you should add a 2nd Fan though to either if you have the room.
But the Winner is the C14 - it out performs the NH-D14 for cooling but is noisier - you'll get 4.6Mhz OC out of your 3770K with this bad boy. - good comparison review here -
http://www.relaxedtech.com/reviews/noctua/nh-c12p-se14-nh-c14/7
Personally, I'd still splash the cash and get a nice AIO Liquid Cooler for the same performance, quieter operation and tidier case presentation - but that's just me