Valley Trails is an upgrade to Valle Vista but still next to 680.
You might want to check San Ramon, Danville and Walnut Creek. Basically head north on 680.
I hope this perspective was helpful to you.
As for Val Vista, yes, there are known problems in that neighborhood, however many homeowners have hired specialists to have their foundations repaired, so don't let that stop you in your tracks. You might miss out on something great!
With regard to Saint Michael, they are simply older, and out-dated, but nothing is 'wrong' with them.
It's very easy to set up your desired criteria. Let me know (in private) the details and I"d be happy to assist you!
In my experience I've seen homes with foundation issues in those areas, and then two doors away there are no such issues. So to plainly say an entire community has foundation issues would be exaggerating. If you like a community, and the homes fit what your looking for and meet your price range, then find a home you like, get an accepted offer, and perform the proper inspections that will give you the piece of mind that you made a sound decision. Also remember that you have a Contingency period to make a decision to withdrawl from the purchase with no recourse per the California Residential Purchase Agreement.
Better Homes and Gardens Tri Valley Realty