What is your current rate of consumption? How many fluid ounces (or mL) have you gone through in what amount of time?
I'm not prejudiced against flacons on GIT, because I think it's fairly resistant to oxidation. I have a roll-on bottle that's not very tight, and it still smells every bit as beautiful as it did originally, despite a lot of evaporation and exposure to air. But if the flacon would be sitting around for 10 or 20 years before you finished it, I might reconsider. Cooled and refrigerated, dispensing every once in a while into an atomizer, then no problem. Sitting on your shelf for 20 years - I'm not so sure.