Does anyone have suggestions for low cost high quality modular/prefab homes that keep green building in their planning.I am looking to act as owner/contractor and keep the cost down on a 1200-1500 sqft home.

Thank you

You might want to ping this guy (Ed Gouin), who recently did what you're contemplating (albeit on a somewhat larger scale.)

http://www.gouingreen.com/

Where are you located? We're working with a Maine modular manufacturer on something interesting. They can deliver to southern New England.