if you only do web surfing office tasks and watching videos you will possibly never see any difference at all apart from screen size obviously
so if you are a more average computer user ..means someone who is just using the computer to surf the web , send emails , write sometimes letters or does collect his household bills and sorts them on the computer , and watch the occasional video and maybe sortout your holiday pictures you will be happy with a i3 and can safe the rest of the cash to upgrade the ram and go in holiday to make a couple more pictures
even heavy duty tasks like video editing and cutting will only take a couple minutes longer