I did not have a survey done. I did have a quick haul and inspected everything that seller claimed had been done. I did some research on the internet as you are doing and just decided that the 800-1000(quotes for a 30ft) was just not worth that money. I have since put that 1000 buck toward new standing rigging.
Seems surveys are a good idea on a big $$$ boats but after reading through some sample surveys online I kinda got the feeling I was paying someone to do nothing more than a visual inspection. That I can and did do.
There is a book at Barnes and Noble : BARNES & NOBLE | Inspecting the Aging Sailboat by Don Casey | NOOK Book (eBook), Paperback, Hardcover
This is all you should have to send and maybe a bit on a haul. I use progressive insurance and no survey required for liability.