When comparing two heatsinks in their stock configurations the Frio does look nice. But when you equal the field out by adding another fan to the other vertical tower style heatsinks it's just isn't as nice anymore.
For less the $40 + another 120mm fan. the Xigmatek Dark Knight is decent for pretty cheap. I got up 3.6 easily with it without much temp change. Could probably go to 4.0-4.2 pretty easily if I wanted. so i vote for Xigmatek.