Having owned a Corsair H50, H70 and H100 and H80i, the Swiftech H220 has been the best experience for me. Generally, the Corsair units were quite good for me...no major complaints, really. One thing I will caution you about is you'll need to do the washer mod on your Sabertooth Z77 if you go with a Corsair unit. I had to do this with the H80i (which is basically the same pump) since the contact on the CPU was brutal.
However, I'm quite happy with my H220 that I'm using. The build quality (despite the pump issues) is quite evident - even just taking it out of the box, you can easily feel it's got some serious weight to it compared to the Corsair CLC units. When I was doing some reading on the H220, I got the impression that the pump issues were more of a problem with earlier units. FWIW, I've had mine for about 6 weeks or so and it's been very good...absolutely no issues to speak of.
My 3770K is at 4.4 GHz, 1.250 V and it keeps my CPU at 65°C on the warmest core with Prime95...so performance-wise, I'm very happy with this. Plus, it's possible to expand the H220. If you want to use a different radiator or add a GPU block, it's doable.