In my opinion, you absolutely need to buy some samples (or ask for some for free) in order to really "experience a fragrance." As you try it more than once (each in isolation - one at a time), you will catch notes you didn't notice were there at first, increasing appreciation. Just my opinion from experience.
As for what you should try, I would suggest any of the following, they seem to be the most popular out of the more "modern smelling" Creeds:
1. GIT (as you mentioned)
2. Millisime Imperial
3. Silver Mountain Water
Popular old-fashioned (more mature smelling) Creeds:
1. Bois de Portugal
2. Selection Verte
3. Royal Delight
Not to throw you off, but my personal favs are Neroli Sauvage and Green Valley...
Have fun sampling