one half of the floor is GA standing....this is also considered the pit. some people on stubhub call it the pit to make their tickets sound better. but GA and pit are the same thing. that's how i understand it. if you notice, the interactive chart on stubhub does not have a PIT section...FLOOR 1, 2, 3, 4 are all GA/PIT.
i had good experience with stubhub. a lot of the ticekts are from stubhub directly.. ticketmaster even sued stubhub for making promoters give stubhub good tickets to events.
i purchased second row seats for ann arbor for face value (though i had to pay $20 shipping) on stubhub a few days before the show. i think you are able to purchase tickets off of stubhub up to 4 or 5 days before the show simply because they want to guarantee the tickets will get to you. I would wait to purchase floor/GA tickets to MSG because stubhub has a ton of them and the prices will drop the closer it gets to show time. that's what i'm doing. it worked for Ann Arbor and it was the best show in my life simply because of how close i got (hand shaking distance)
ok...i gotta go, people are waiting for me.