the asus strix and msi based on the same heat sink are low noise gaming cards. right now your in the middle of team red and team green switching over to there newer gpu. nviida pascal cards should be out in early 2016.
http://vrworld.com/2015/11/19/14nm-amd-greenland-tapes-out-attack-on-nvidia-pascal-intel-xeon-phi/
http://wccftech.com/nvidia-pascal-hbm2-16gb-1-tbs-2016/
i would hold onto your funds and pick up the newer cards.