SinxarKnights :
If you have money to burn sure. I upgraded from a 970 to 1070 myself. It is a noticeable upgrade but really the improvement isn't that huge (about same as 970 -> 980ti. 1070 is slightly faster than 980ti). If possible I would go with at least a 1080 or a 1080ti if you can afford it. Also consider what resolution you are playing at. If you are at 1440p then a 1070 can be worth it (its why I upgraded).
Problem is gtx970 is only 3.5GB.
I can play GTA V with 970 on ultra and at 4k with 30FPS but no MSAA
I can play GTA V with 970 also at 1080 on ultra 60-80FPS and 4x MSAA
If I upgrade to 1080, can I play GTA V at 4k on ultra with 60+ fps?