a gtx 760 will handle most current games at ultra if you switch off multisampling. I am running bf4 for example at 60+ fps with ultra settings, just multisampling disabled.(capped at 60 but it doesnt drop under the ocasional 54 fps)
noone seems to be mentioning that.
yes a gtx 970 is alot better. but the gtx 760 isnt a bad card neither. but for futureproofing, you should go for the 970.