Giroud, Mkhitaryan and Hendrick are my top 3. Henderson's was obviously a very good goal, but you see those scored once a week somewhere in one of the other leagues in Europe, doesn't have goal of the season on it for me. Compare it to one of the goal of the month contenders in December 2006, and it's not that special.
Now Giroud has made the scorpion goal common, but the fact is, it literally never happens. And Hendrick's, it's just three perfect touches and the perfectly looping half volley that hits the back of the net, so aesthetically pleasing.