Prescottchels, the OP asked for reliable information. The reliable information on the safety of UC breech hasn't been compiled by anyone yet. What we do know is that in conventional medical settings, the risks of breech vaginal delivery vary greatly according to the practitioner and the position of the baby. It seems reasonable to bear these facts in mind when considering UC.
Personally, I think we'd be doing the OP a disservice in not helping her educate herself on all the ins and outs of breech delivery. Even if she ends up delivering in the hospital it's great information to have in mind.
That being said I have a scanned copy of Gregory White's Emergency Childbirth book if anyone wants a copy I'd be happy to email it as an attachment. Just shoot me a PM. I also have some other emergency childbirth fact sheets, including breech, saved as jpg's that I'd be happy to share as well.