Newbie in market for a GMT-IIc or the Submariner

[RolexNoob]

Hi All,

I am in the market for a new Rolex. I am trying to decide if I should go for a Subm Date, GMT-IIc or the discontinued GMT-II Coke

Have a few questions for you xperts:

1) As this is going to be my 1st Rolex. Which one of the above would be consider a good investment? in the long run.

2) Do all of the brand new Rolex have the Hologram sticker on the back of the watch? I was told by a local AD that Rolex stopped using the sticker since last year. Is this true?

3) What should I look for when I buy a new watch? anything I should pay attention to besides look for scratches and etc?

Thank you very much.