For an extensive green remodel like yours we use the ReGreen Guidelines of the USGBC & ASID. They sound perfect for your home. You can visit www.regreenprogram.org for more information. The new NAHB Green Building and Remodeling Standards are also brand new to the market but you likely will not find a contractor familiar with them on the Houston area.
Michael Strong, CGP, CGR
NAHB 2008 Green Remodeling Advocate of the Year
Vice President, Brothers Strong, Inc.