GA is the only way to go. i was one person from the stage, so damn close to sweaty chris lol and theres perks!
you might catch the camera the boys each throw to the crowd, amazing photos, maybe even reach out and touch chris (seeing how he manages to be all over the stage all the time) and after the show they give out picks, setlists etc.
and people tend to get into more then the people seating apparently.
when i went i went a few hours before hand and sat by the gates but no spots are guaranteed. but ur chance is increased it all comes down to how much you want it and a lil luck. worth it but