I have moved from a 290 Tri-x to a MSI 970 and I am glad I made the switch.
Don't get me wrong, the 290 TriX is a fantastic card, very cool and silent in comparison to other R9's.
Personal I have found that the 970 is much much cooler, and I found it was quieter than the already quiet Trix.
Plus I love the DSR feature, the quality of image is very noticeable on a 1080p monitor.
As for performance, I was lucky enough to win the silicon lottery with my 970 as I am stable gaming at 1620/8050 with no added volts. Max temps are peaking at 63c with gaming with 4k DSR and the fans are not peaking 50% and are still dead silent.
For me the move cost me £50, and for the less heat and DSR a lone it was worth it. Then again I am one of them guys who would rather spend around £50 each gen release the have the newer tech than wait 2/3 years and folk out £300-/+.
This man says it all.
Another ex 290 owner here and switched to the 970. It's slient, cool and overclocks extremely well. Gaming with memory at 8200 and core hitting 1600 it performs well to boot. Faster than my 290
Nvidia software is a delight to use, everything just works.
That said if your going to run vsync at 60fps then both cards would be fine.

