<font face="Verdana, Arial, Helvetica" size="2">Tossus le Noble is the place to go</font>
...also known as Toussus le Noble... but I think I preferred your version
As you say Toussus is OK, but for convenience and proximity to the the centre of Paris, you will find Pontoise tough to beat. It is a shorter flying time for most Britishers than Toussus, and the local RER (underground) station will get you to the centre of Paris (as opposed to Versailles which is 15 miles out) in less than 15 minutes.
Pontoise also avoids some of the more compressed airspace and awkward reporting points that Toussus involves.
-2Donkeys