One of the key features of the NH-C14 is that it has 2 140mm fans mounted on the heatsink. The nice thing about this design is that you can remove either fan to get more clearance underneath the cooler or you can make the whole heatsink not as tall by removing the top fan. Of course if you leave both fans installed you should be getting better performance. . .
FULL STORY @ BCCHARDWARE (http://www.bcchardware.com/index.php?option=content&task=view&id=9465&Itemid=40)
The XtremeGear HP-1216B heatsink utilizes a dimpled surface texture on its raw aluminum fins as well, and quite amazingly retails for $22! Standing 153mm tall, the HP-1216B heatsink is equipped with a single no-name 120mm fan that rotates at 2000-1000RPM and is illuminated by four blue LEDs. At full speed it's moderately audible, and at the slowest speed you'll get good performance a nearly silent levels.
FULL STORY @ FROSTYTECH (http://www.frostytech.com/articleview.cfm?articleID=2499)