well dude, i highly doubt he gonna keep the comp for 10 years lol, and even the 940 wont help him their. look at the price difference, around a $300 difference, the 920 will more than greatly edit videos to, the 940 may do it a little bit faster but not $300 difference faster. Both cpu's are really close to each other. I currently own a Q6700 and its not as good as an i7 but it does more than good in video editing, i dont do much of it, im more of a design guy. Im a designer and when i get a customer im designing for over 6 hours a day, my cpu tares through everything.
I know it wont be as good in 2-3 years, but im sure ill get a new cpu by than.