Nerd Rage!

So, my friends found out the other day that I've never seen any of the Star Wars films, and they've been giving me shit ever since. So I finally broke down and borrowed all the movies from a friend, but I'm not sure how I should watch them.

Should I watch them how they were released (4,5,6,1,2,3), or should I watch them chronologically (1-6). I'm not really sure, cause I already know what happens in the movies (Darth Vader is his dad, ect ect). What do you guys think?