I got my septum pierced at 16g back in the septum club thing of 2007 and it healed fine. I have seen many septums at 16g that also healed with no problems. I chose 16g because I felt it suited my face best, especially because I already have several facial piercings and didn't want it to overwhelm (or be too visible to small children looking up at a flipped up piercing). That being said, I do wish now that I had pierced it at around 10g (especially after seeing how great it looks on Jess in some pics she posted). It is a personal descision and one thing I suggest is to "try on" the piercing at several gauges by hanging a circular barbell or captive from your septum to help you decide.
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---sways sig---
It is known that there are an infinite number of worlds, simply because there is an infinite amount of space for them. However, not every one of them is inhabited. Therefore, there must be a finite number of inhabited worlds. Any finite number divided by infinity is as near to nothing as makes no odds, so the average population of all the planets in the Universe can be said to be zero. From this it follows that the population of the whole Universe is also zero, and that any people you may meet from time to time are merely the products of a deranged imagination. [:-goldfish]