Most of the close suburbs (within 1 hr of Paris) have everything you would need within walking distance. In my village I have two grocery stores, 3 bakeries, 2 butchers, 2 large grocery stores, 4 flowershops, plus 2 buslines all within 5 minutes.
By bourgeois, *theophane* basically means fancy. St. Cloud is a very rich neighborhood, the buildings are lovely and spacious (but it's probably much more of a hike to get anywhere on foot--) and all the shops you find will be geared towards higher-income people.
As for strikes, lol, no, they aren't just a few hours or a day. Often they last several days. And it can mean anything from 2 trains out of 3 running, to no trains at all. It can last only a day, but more often is several days or even up to a week. So far, I haven't dealt with a major strike since moving back, but I also don't need to go into Paris, it's usually optional! To be fair, strikes are a problem no matter where you live in France, and if you live in Paris it isn't better.
Will it be hard to find a rental? I don't know. It depends totally on your budget and where you are looking.
Some websites: check the websites for Guy Hoquet, Century 21 (real estate chains). You can also check
www.seloger.com and
www.pap.fr (seloger is a website with ads from real estate agencies, pap is individuals renting or selling directly to other individuals.
What to bring: shipping goods is expensive. When we moved back, we had about 1/2 of a 20' container, the move cost us over 7000 dollars. And moving stuff BACK can be problematic: we spent just over a year in the US, and we had issues with customs-- they weren't sure they would let us ship back our household goods without paying custom duties on them (all our fancy French Ikea furniture!

) So check moving prices / estimates before deciding what to bring, and check US (or Canadian, not sure where you are) customs. As for your car: depending on the model/make you may not want to bring it. For example, in the States we had a Nissan Altima. They don't sell Altimas here; maintaining or repairing it would have been very difficult. We sold it and haven't bought one here yet.
The truth is that it is very expensive to move to another country. You will have to buy all your electronic stuff again, from appliances to your clock radio.
Other websites to check: craigslist, for replacing household goods you don't bring.
And, HI! *theophane*! We are in Verrieres, and loving it. I can't remember what was so great about Paris now! lol, it seems so loud and polluted and crowded compared to here. We ended up deciding against the Waldorf school for DS, as our neighborhood one (les Gros Chenes) is quite small and charming. And close to our apartment! With a newborn in winter this will be important!

Let me know next time you are in the area so I can say Hi in person!