from what I have read as I don't have alot of experience in this area, parent raised cockatiels can be just as nice as long as them have been handled, if she has to chase the birds around or wear gloves to get it out you might want to look elsewhere I found this article that gives some information.I got a call back a couple of hours, she was very nice, but told me she had stopped breeding for this year, and would start again at Easter or around that time. To be honest, I can't really wait that long!!
I have also been e-mailing a lady who lives in the same town as me and she has some parent reared cockatiels for sale for £10 in an aviary, she says that because they are young they will easily grow to be as tame as a hand reared one, is this true?
http://www.larrysbirdshows.com/buying_birds.shtml