Hi Meimango,
Glad it was useful. If you're digging on the internet, Mary Cronk is another wealth of knowledge on breech birth.
If you do decide to investigate vaginal birth, make very VERY sure you know what kind of exerience your practitioners have and what kind of birth they would support. I had a very hands off birth, with midwives that were confident that they could just let me get on with it while observing and they'd know if/when they needed to intervene (hands off the breech!). I was on all fours, which allows gravity to work on the baby's body to help release the head safely. I was supported in labour - I wouldn't say I was particularly assisted.
If I'd gone into hospital for a vaginal breech, it would almost certainly have been consultant led, and would almost certainly have had me in theatre, in stirrups, with an episiotomy and having forceps waved around. Some doctors still use traction to help deliver breechs. In my mind, all of that adds up to a much greater risk of damage to the baby (not to mention the mother...). If that had been my only choice I'd have been in for a section like a flash.
I don't think they recommend pre-labour scans to estimate pelvice capacity anymore - most women release a hormone in late pregnancy that loosens the pelvis and gives extra space. If you're not on your back your coccyx should move as the baby decends, allowing something like an extra 4cm diameter! Similarly, scans to estimate the size of the baby are notoriously innacturate, especially as the baby's head is designed to squash a little...
The scare story you're most likely to hear is the "head stuck" one. This tends to derive from pre-term babies (which are more likely to be breech as they just haven't got round to turning rather than for any sinister reason), where there is a dispraportion between the size of the baby's head and hips. If you talk to midwives that have seen a lot of TERM breech births, they just don't find it happens as the bum and head are pretty well the same size.
Good luck for Thursday. At the end of the day there's no right or wrong answer. You just need to do what feels right for you. Just don't be afraid to ask questions and keep asking them until you get answers that make sense . You also don't HAVE to sign the consent form then and there if you don't want to - they may not like it, but it's a big decision and if you need more time to think then take it!
(Oh, and I've just found a brilliant website: www.breechbabies.com/. At least it should be - the java scripts are playing silly buggers for me, but from what I've seen it looks like there's masses of info there )