first , i3 can run gta V easily
and about your specs , for gpu like gtx 960 , I3 cpu is great choice and there isn't any bottleneck with that .. you can see details in this link
http://www.techspot.com/review/972-intel-core-i3-vs-i5-vs-i7/
just my personal experience , in fact many of these (norton , avira , kaspersky , avast , mcAfee and ...) are in the same level in terms of detection score , no need to be worry about it
Acer E14 that's what you got ? Right ? In link that you posted in fist post shows this model has nvidia 820m + intel HD . 820m is more powerful than 8800 series