The green roof tiles are a really neat product but I just wanted to give a word of caution. Depending on your roof and climate region these could cause potential moisture problems in the future. I would recommend visiting with a local architect or maybe the local US Green Building Council about it prior to installing.
Without proper drainage the weight and moisture have been known to cause damage to homes.
I think its great that both of you are making such great efforts to having a more sustainable home. I would love to hear what both of you end up doing.
Oh, and I have heard GREAT things about Solar City. Would love to hear if either of you do that also. I would love to see them move over here to Houston!
I always advise people to forge a relationship with an agent long before they need one. That way questions about paint colors, landscaping and remodels are a snap. Most agents would rather talk to you now then later when you need to sell and might be in a difficult situation.
Also check out Solar City for their solar panel lease program. Our neighbors just did it. http://www.solarcity.com/solarlease/SolarCityAbout.aspx
Personally I think the roof deck will improve your resale value more. If you go to some local open houses you'll see big price jumps for view houses over similar houses with little or no view.
Oops, I just noticed the date of your post, which way did you go?
Also, the next green home tour will actually be in SF in September.