What age to spay Female GSD?

Question
I have a 5 1/2 month old GSD female that is secuduled to be spayed on 4/24/07 which she will be 6 months old, is this a good time to have her spayed?  I read somethings that say 6 months others say at least 8 months.....Please help me, I need to know I am haveing her spayed at the right time!
Thanks for your help!

Answer
I am not sure it is breed specific.  Six months has been the conventional wisdom for years.  Many people are moving toward 4 months.  I put off having my Lab, Holly, until 5 months because at 4 months, there was too much going on in December.  

Whoever said 8 months is not a reliable source of information.  Females can come into seasons early as 7 months.  Once they start, most vets refuse to spay them until it is all over with.  Lately I am seeing almost a question a day from somebody stuck with a female in season, the hassle, the risks, etc..  Stick to your schedule, and thank you for being a responsible pet owner.  Life will be easier for her, you, and the people at your local shelter.