Thanks for the information, especially about the decking.
The general contractor actually gave me a proposal of $1,500 less than the roofer, because he works from his home and the 2 roofers who gave me estimates both have rather large offices. I'm just wondering if he knows as much about roofing. My father tells me that any dummy can put a roof on, that it's not that difficult, but i guess i'm just a suscpicious of the general contractor because the 2 roofers told me to stay away from general contractors. From what i hear from the roofers, putting a roof on doesn't sound so easy, especially with all the ventilation systems, etc.