IMO it depends on what you want the horses broke for.
I find that some techniques don't work so well for creating the balance we typically want to see in a young dressage horse. Personally, I prefer to work with trainers who have a proven record of developing horses for the young horse classes. However, it is ideal to be able to do the bulk of the work ourselves. Young horses are not so terrifying!!
Dr. Ulf Moller is an excellent resource and to have access to a symposium with him is a wonderful opportunity - jump on it.
They say money doesn't buy happiness -- well happiness doesn't buy horses!