I went with the Zalman 9500 for my 170 because I didn't want a gigantic 12cm fan hovering over my mainboard. No temps to report since the new rig isn't built yet, (waiting for PSU and GPU).
The 9500 is reported to do better in certain situations than the Ninja and TR 120 - "The table above makes it quite clear how good the Zalman 9500 is: At roughly the same airflow it significantly outperforms every other heatsink we've tested." - but with some caveats... review
Mine will be going into a Silverstone Temjin TJ06 case; it has the air tunnel so I can run the 9500 at lowish speeds.
Of course, YMMV.
The 9500 is reported to do better in certain situations than the Ninja and TR 120 - "The table above makes it quite clear how good the Zalman 9500 is: At roughly the same airflow it significantly outperforms every other heatsink we've tested." - but with some caveats... review
Mine will be going into a Silverstone Temjin TJ06 case; it has the air tunnel so I can run the 9500 at lowish speeds.
Of course, YMMV.