should i upgrade my pc with a i5 4670k and 7870 xt sapphire or r9 270x duel x sapphire edition..i will play at 1668x900 moniter..at high settings with fxaa..and i wanna know that will this rig get me atleast 70 fps at max on latest games and future games..and if i gonna buy this rig so make sure i dont need to change atleast for the 3 4 years..please help me to find the right way ..please help..i am really confused about what rig should i make for a future proof ..