Hi David
Although companies and trust deeds may appear to be relatively generic, this is not wholly the case. Company constitutions and trust deeds prepared by leading solicitors will contain items that may assist your business down the track and which cheaper alternatives won't necessarily have. My business uses DBA Lawyers for all trust deeds and companies and they are known as being amongst Australia's leading providers. They typically provide deeds to accountants who then provide them to their clients, so perhaps check with your accountant which solicitor is being used.
cheers
Angus Morrison
http://www.liftbusiness.com.au